This post is so effed up for so many reasons. But since it's such an interesting topic to me, personally, I'll take a moment to adress your claims.
there will never be peace after death for killing yourself. you may believe deep down in yourself hearts that death is the finale, that's it, nothing after death. where you cease to exist forever and ever but apparently that's not the case, there is hell and there is a heaven. although it may be hard or impossible for you to believe this. you may think there is no purpose to life, we just exist to suffer or to find "our own purpose" as many people say. the truth of reality is God (whether you believe in him or not) hates people who kill themselves, he didn't put you in this world to die at your own hands.
I first must state that I am spiritual but not religious. I view myself somewhat as a Gnostic person. For those interested:
https://en.wikipedia.org/wiki/Gnosticism
All your arguments are NOT based in an unreligious view, or even are universal humankind views. You are adressing suicide as an "sinfull" action, which is a view mainly present in Christianism and other Abrahamic religions.
https://en.wikipedia.org/wiki/Abrahamic_religions
In this religious views, the human is a flawed being, that must comply with repentance and must be humble before an omnipotent deity, kneeling in your insignificance, to receive forgiveness and be able to receive the gift of eternal live. Thus, suffering is an act of "god" allowing you to "pay for your sins". The problem with this argumentation is that, is "god" not perfect? If he is in fact omniscient, omnipotent and omnipresent, so that means all humans were made, in fact, unperfect. And doomed to suffer with the imperfections of the flesh, which requires inhuman will to surpass. Thus, we are doomed to fail. For example, carnal desires, that are basic nature of any living being, since the human is an animal, and as such, it has the instinct to reproduce.
So if this views are correct, we are only toys in the hand of an sadistic deity, that enjoys watching our struggles. Christianity is a philosophy that proves to be flawed in its own line of reasoning.
Now, to MY views. I do not believe the CTB,
per si, is morally wrong, and condemn your soul to eternal suffering. I calll bullshit on that. But I DO believe that YOUR personal morality may or may not condemn the act, and thus, based on YOUR personal beliefs, your own beliefs can make you suffer after dying, for this moral weight you inflicted on yourself. In another post, I used this logic to explain that:
For example:
If you live in country A, where possession of an specific item is illegal;
And your friend lives in country B, where the same thing is licit;
For YOU it will be a crime, but for said friend, it will not.
And adressing now this part of your argumentation:
there is peace in the afterlife but only if you endure this life. you must keep fighting, no matter how hard the universe or whatever force is out there tries to bring you down. this life is a test to test which one of us are the best of people.
This is NOT universal. In fact, throughout human history, we have been able to identify numerous mentions of the act of suicide as an honor, and even that it would lead to a "moral pardon". The most classic example of this would be the act of harakiri and seppuku. Speaking briefly on the subject:
Being an extremely painful and slow means of suicide, it was favoured under BushidĹŤ (warrior code) as an effective way to demonstrate the courage, self-control, and strong resolve of the samurai and to prove sincerity of purpose.
https://en.wikipedia.org/wiki/Seppuku and
https://www.britannica.com/topic/seppuku
The line of argument that you are using to condemn the act, and to argue that the immortal soul will be condemned, is nothing more than a cultural vision, coming from the predominant religions, which places the human being in a position of servitude in relation to a controlling and oppressive deity. In other cultures (which today, in addition to having been lost, are seen with strangeness), one can find mentions of the act of dying as part of the cycle of life, something that was even adressed in the horror film Midsommar. Where upon completion of a life lived in favor of society (or tribe), the cycle ends with a jump off a cliff, preventing you from becoming a burden to the community and avoiding the slow wear and tear associated with advanced age. The ritual itself mentioned in the film is not historically recorded and is more of local folklore, but it's not as if the Norse recorded much in writing.
https://en.wikipedia.org/wiki/Ă„ttestupa and
https://en.wikipedia.org/wiki/Senicide
In addition to the above mentions, there are also records in which a wife could throw herself on her husband's funeral pyre, killed in war, and such an act would be seen as a very great honor and even a very profound act of love for society. The opposite could also occur, in cases where the wife dies and the husband already has a grown lineage, and wants to follow his wife into the afterlife. That part specifically I can't provide links at the moment, sorry. EDIT: Found this that can complement a bit if someone would like to read more:
https://www.duo.uio.no/bitstream/handle/10852/64245/1/Susanne-Nagel-MAS4091-Thesis.pdf
All this, really, just to complement what I mentioned above. The very view of "heaven" and "hell" is Christian, and not present in most other religions. We find parallels, yes, like the Greek Hades, or the Nordic Hel, but they are the world of the dead, and not a place of condemnation and damnation like the professed Christian religiosity. The very view of a single deity and monotheistic cosmology is the exception rather than the rule. The condemnation of suicide is a cultural act, and not necessarily a spiritual one. The compulsion for life, and the romanticization of suffering as something important for the wisdom of the soul (or to receive a "prize" after) are regrettable marks left by the dominant religions in the last centuries.