i think it is too early to decide that what i have to do with my bitcoin after 20 years of time.
You are right. 20 years is still too far to think about it. There is a lot that could happen before then. Bitcoin may crash or it may flourish more. But before we dwell to that far future, let us first deal with what is happening with bitcoin today.
My never ending goal with my bitcoins is to increase it and I think everyone does. But just like they said there is no guarantee that bitcoin will still exist even after 20 years cause many things can happen and the future is uncertain