What is the point of being immortal, if lt bring eternal suffering, Life in itself current form is suffering for many, unless you solve all other problem other then just mortality, life in itself bring difference with long lifespan. Inherently I see no difference if I live 100 years or 1000 years.
I’d simply advise to get on getting on. It is. You are you so see what you can do with it in the way you feel you can.