The hope for an afterlife is like receiving a very valuable gift and then getting mad because you want a bigger gift. My ex-sister-inlaw a diehard witness said once that she refuses to be happy now in this wicked world because she is waiting for the "real" life in god's new order.
I thought afterwards of her wasted life and inconsiderate behavior for the gift of life. If god had any balls, he would tell her to "go to hell." (no pun intended).
Life is a gift. If I was told for a certainty that this is it, there is nothing else, I would treat my life as a gift and be thankful that I am alive.
If I was told for a certainty that there was an afterlife, I would still treat this life as a gift and be thankful I was alive.