Choosing to live is a temporary decision, choosing to die is a permanent one, so maybe start with thinking about some immediate changes you could make to your life to see if anything will improve. Finding a new hobby, making new friends, cutting out a bad habit, seeking therapy or even just a support group like in the recovery forum. Make some small changes and track the trajectory of your life from that point forward, is it improving or getting worse? If it's improving you can keep at it, always reserving the possibility to CTB for tomorrow or another day.
If you see no improvement or things get worse, then this will likely strengthen your resolve to CTB and help remove last minute doubts. Essentially: try until you've exhausted trying first so you know whatever decision you make is the right one for you.
I feel similar to you and I want to try, I want to give life another chance, but right now it all very much boils down to how the events of this week unfold since I am faced with a terrifying situation that I don't want to be here for if it happens. If that situation doesn't come to pass, I am going to try to give life at least one last try, so that I'll be certain if I do want to ultimately die or not. If that makes sense.