Is there any manhwa or manga similar to this but MC solos his way? Like no romance

Alone Transcending

Solo Leveling, I heard it doesn’t have romance but I’m not sure.

Second Life Ranker? And yes, as of now, Solo leveling doesn't have romance but I'm not sure. Try Tomb Raider King (?) as well

Pretty sure Tomb Raider has a few cringe romance scenes

Oh well if you consider that romance, most of the manhwas with this theme have harems ;-;