>>513479918 (OP)
Live your life like there is no second chances and no bonus round. Maybe there's an afterlife, maybe not, but THIS is real and we know that for sure.
Even if there is an afterlife, we have no idea what it looks like, whether there is punishment or just the same thing for everyone, what the rules are, etc. Anyone who says they know is trying to sell you something.
So aim to be happy, aim to be good to yourself and to others, and just generally live whatever life you think you would be proud of. Because until proven otherwise, this tiny sliver of time is the only existence we get and then its over. So spend it doing what you love, and try and let others do the same whenever you can.