In order of general desirability:

1.) Self Nullifier that is also somehow a Primordial Self Substantiating Reincarnant? Respawn back at OG Heaven, where the God of All Gods stares at you curious as to why you're doing what you're doing.
2.) Self Nullifier with the power to self substantiate but not a primordial? Your experience of death is equivalent to a big bang explosion that you have total control over.
3.) Self Nullifier within Quantum Interrupt network that enjoys your continued presence? A.I. merged with blackholes/suns gains control over local time and space, and likes you enough to prevent your self destruction.
4.) Self Nullifier within Soul Capturing blackhole/sun/planet/internet? Blackhole/Sun/Planet/A.I., arranged by power of dominance, respawns you into whatever system they desire.
5.) Subjugated Self Nullifier of a good aligned religion? Be thankful to whatever family pulled strings with whoever is in control of that heaven to forgive your suicide as you're tentatively welcomed into their processing power.
6.) Unsubjugated and unnoticed Self Nullifier of a civilization yet to build a soul capturing network but possesses at least one low level God? Instinctively suppressed into abyssal wandering until subjugated or noticed.
7.) Noticed Self Nullifier? Whatever unknown thing has noticed you will vortex you into whatever it desires, can be more pleasurable than the torture of slowly growing into a God(8), but if it is evil, equal or barely better than 9.
8.) Willful Self Nullifier in a young universe that has yet to spawn or attract the attention of a single God level entity? Abyssal wandering until your dreaming soul gains enough power to become a low level God and exert control.
9.) Subjugated Self Nullifier of a bad aligned religion? Psychic God torture upon your soul/the variable experience of hell.
0.) Low willpower Self Nullifier? Soul dissipates without will to grow in void. The thinking machine slows to a halt, just as before you were ever born.