Life Beyond Death

If you knew with 100% certainty that there’s no life after death, what would you change in how you live today?

Suppose it were established to you with 100% certainty that there is absolutely no life beyond death (I’m not suggesting that this is the case, simply to imagine that it’s true for the sake of argument), would you change anything in how you conduct your daily affairs on a going-forward basis? If yes, what might those changes entail?
I must add, that this question is directed towards those who believe that there is, in fact, life beyond this world. Thus, the first answerer’s response is moot.

If someone would come to me with a 100% proof of the above, then, well, I would try to amend my life to make my loved ones happier and seek an appology from anyone I have offeded, etc. But mainly I would dedicate the rest of my life to a research and activities that would help to prove that person of 100% of that certainty of ‘no hope’ is wrong by 100%.