
I’m not sure if they would be considered just as good but it’s a few I’m very
attached to.
Black Haze (it’s currently on hiatus I think, but it’s really good)
The Gamer
Tales of Demons and Gods
Douluo Dalu
The New Gate
Ubel Blatt
The God of Highschool (haven’t completely read through it myself but I know quite a few people that are really attached to it)
That’s all I can think of at the moment but I hope you can find something as good as solo leveling to read.

http://www.mangago.zone/read-manga/ranker_who_lives_a_second_time/
Obviously people will compare such manhwas with the similar concepts to Solo Leveling since this is widely popular; however, I think the one I liked above has a different premise on an MC that has the "player" powers but isn't using it for the good of others. The MC in the Ranker manhwa has his own reasons, and I actually find his character and motives unique.
Enjoy to whomever is willing to give it a try.

BH is amazing! Aside from the plot and moments that make you tear up, it's also interesting to see how the art improved over the course of the chapters. But yeah, I agree in not knowing if it's going to continue. Last I heard, the author started a new work, but nothing about continuing BH or not...maybe there are still issues with the last publisher and all. :/ Can only hope...
Since I've started reading this, I've been looking for a manga, equally as addictive, to read in between updates, but Nothing, Nada, Zilch!
not a single manga comes close to how crazy good this manga is
that 9.9 rating is no joke and its the only one I've seen with it so far
I understand if you don't see this as a masterpiece but the 0.1% that dislike? are they redheads? because they have no soul. a website glitch maybe
feel free to recommend mangas that are as good, if you can find any