If I may, with regard to being promised Olam Haba for this or that, the person who ends his life by choice hasn’t fulfilled his end of the bargain. His life was destined to be X amount of years and instead of “going along with the plan” a suicide changes that plan, supposedly (since we don’t know, yet. with certainty if this is how the cosmos works).
A person who took life into his own hands abrogates this decision from the Master of the Universe whose province it is to shorten or to extend or to keep things as decreed from birth. After the suicide takes place, all of existence must now be reoriented by the Master of the Universe to accommodate this unplanned circumstance. The person committing suicide has “made a mess of things”, not just for himself, but for everything and everyone, here and Above.
And in taking his own life, as I stated in the beginning, he did NOT fulfill his part of the bargain that would have promised him his share in Olam Haba.
All what I say assumes that a person is making a sane decision, though even this cannot be certain and is only known to the Heavenly Father, because it is He and only He who will judge and who can judge, as only He knows the heart and the mind of the person. And only He can evaluate every small detail to see if there are mitigating circumstances or if the suicide was a true and real affront against the Sovereignty of the Habeshta.
“The secrets of God are for Goad alone.” I think that would apply to ending one’s life “early” and also for us to think we can truly judge the person who does do the most unfortunate thing.
I hope that my writing isn’t too muddled on these ideas.