No one can guess what happens in Endgame - RDJ

Thanos dies or restores everything.
There is some message about the need for multiculturalism (the mixed kind, not separate nations-except Wakanda), the need for a lack of barriers (walls),and perhaps a reference to financial reparations for those who felt disenfranchised. Also something about the future being run by women.

These are the messages I expect.