Hopefully, it's the solution to end all problems. Hopefully, there's nothing after this. But sure- it's a possible solution along with other solutions like trying this or that to solve whatever it is that's blighting our lives. I suspect most people have tried plenty of other things by the time they are seriously considering suicide.
Are any of the things associated with recovery solutions? Therapy, medication, exercise, socialising, walking in nature etc. Will they totally solve all our problems long-term? Maybe for some. For a lot- no. They will maybe just be temporary solutions to longer term problems. The act of living tends to generate problems. So- pessimistically put, death is the solution to life! Depends on how much you like life and fear death really.
Of course, there's the weird paradox that we likely won't be able to 'enjoy' the peace of death. So- in terms of what we understand as conscious fulfilment, it seems unlikely suicide will give us that. Not afterwards anyhow.
Still, in a way, I'm trying to benefit from it now. I've pretty much made a conscious decision not to worry about my future because hopefully, I won't have one! I've spent so much of my life desperately and anxiously looking for solutions to make things better. New jobs, new places to live, new diets, new friends, self help, therapy, medication, education, fitness etc.
Honestly, I can't wait to just let all that go. All that effort and stress and ultimate unfulfiment. I'm simply not convinced that my (quality of) life is something I can 'solve' to my satisfaction.
That's the crux of it I think. If we either don't have an aim in life or, we know that our goal is utterly unrealistic, we can get to a point where we question why we are continuing. If the problem of life (quality) doesn't feel solvable, we may not be willing to keep throwing resources at it.
I think I played a game of chess once where neither of us could checkmate. We just ended up chasing one another around the board until one of us resigned. Life feels a bit like that. You start off wanting to win. Trying your best but then, so much is lost but you still carry on to the last few pieces. Both of you know you can't win outright- the other person is going to have to resign. Initially, you keep on going, one move at a time knowing it's going nowhere and it could potentially go on forever. At first, you don't want to be the one to back down and quit but after a few minutes, it starts to seem less important because it's so utterly tedious!