I have a suggestion I think you'll like a lot: Omniscient Reader's Viewpoint. Return to Player shares a looot of similarities with ORV (such as people being avatar of gods/constellations, the stream system and mc knowing things that other people don't). And (for me) the best novel I've read until now (aside from solo leveling) is Second Coming Of Gluttony. The beginning won't look that attractive but trust me, things will get hella dope (specially on the novel) and it's also about reincarnation after everyone dying and all. Lol I have so many recommendations cuz this is basically the only genre I read aside from yaoi
This is more like Omniscient Reader's Viewpoint rather than Solo Levelling. This almost has nothing similar with Solo Levelling though...
But with ORV; they have "gods" (or "constellations" in ORV) watching them through a "channel", choosing an "avatar" (or "sponsor" in ORV), etc. Also with Kim Sehan's 2nd live, one of the protagonists in ORV has "regressed" for the 1863rd times, which means he has lived his life (experiencing those apocalypse/games again...) for the 1863rd times and he can't really "die"; so yeah, if you like Return To Player, you will def like ORV.
I personally like ORV more though since they hv gaybaits so much sksksk
(And the 2nd MC in ORV is hot af (▰˘◡˘▰)
THIS IS SO COOL, IT'S LIKE SOLO LEVELING BUT OAMGTHAD IM EXCITED FOR THE NEXT CHAPTER AAAAAAAAAAAAAAAAAAAAAAA HOMAYGHAD I CANT WAIT HUHU