I actually don't expect that to happen, as one of the major plot points will be him trying to assimilate again in between humans and make a name for himself, without revealing his ... constellation-ness. Since the whole thing started with a look into the future, when Odaigon was already following him and he had white hair as well as those dragon-ish blue eyes, it was important to first find out who he even is and how he got to that point. As they just stated, we now know what happened, maybe that's the starting point for him to finally get back to earth.
Probably in season 2 of the story. If they would divide the seasons from exploring in the abyss and train to get stronger then go to earth to obtain believers and train to get strongr. Or if another season would be made it would probably be stronger constellation trying bring him down.
Just a hunch
the author is so tricky, don't tell me the MC will find the earth in chapter 100++(╯°Д °)╯╧╧ hopefully not hahaha