Yes, post-mortal Heaven... But what should we Do Now?

The answer could be - Do what you evaluate as best: start now. 

BUT - don't expect to make a system from it. 

Do not try to create a formula for world-saving, or even for world-improvement. 

Your answer as to what to do, now; the best answer you can diligently and honestly discover and devise; is something about which you cannot persuade others - therefore you should not try. 

You should not wait until after persuading enough others, and launching a movement before you do it. 

It is (nearly-) all about your discernment, your insight, your actions in your life. 

And what happens to most people, or even the few people that surround you; is something you cannot control. 

And it is actually "control" of others that motivates most supposed world-bettering and evangelism. 

Give up control fantasies, if you can. 

Work from love, not from systems - and where there is no love; you can do no Good.