I had a big blog written out but it got like erased cause of my stupid computer so I will try to sum it up on these terms:
nearly all the questions were answered
not enough world building and mythology
people might be burned out on this type of show with similarities to the show manifest
the actors might not want to return
what would be left to show?
so yeah I think lost needs to rip and just leave it that way otherwise it would be disgracing if they tried to bring it back, lost doesnt seem like the type of show to make a franchise out of, at least I dont think so