your bodies death is the doorway to Eternal Life -
for when your body of matter mass liquid & gas -
ceases to function - your Spirit is - set free from -
the confinement there-of and - once again realizes -
its Eternal & Divine - Source Origin Essence & Being -

so the answer to your question is - Yes -
U will have as many Earth experiences -
as U so desire &/or require to - Awaken -

No...I doubt it. I don't see any evidence for life after death.

Maybe. There IS some evidence to that effect, especially for things like reincarnation. But we really don't know, which is the main downside and hardship of being an agnostic: we don't have the comfort and smugness of KNOWING anything metaphysical for a fact.
The upside, of course, is we're firmly grounded in reality. Theists and atheists can't say as much which, given their absolute certainty one way or the other, is for me a consolation.

Let’s not concern ourselves with returning to the cosmos.

Unless the cosmos is here on earth, the journey requires our remains to increase their speed until they escape earth’s gravity.