I agree with Nafinator, Solo Leveling NEEDS an anime adaptation. That manwha is more lit than anything I've read recently.
Another Manga I love is one called SHY. It's about a world where each country has a resident superhero, following along the life of Japan's hero, SHY. It has both amazing action and solid character development, and a neat cast of heroes that play with country stereotypes while also showing off the author's creative ideas. I personally love Spirits (Russia's hero) most; peak character design and development right there. It's high intensity enough to be a hype anime along the lines of BnHA and KnY. It's about 40? chapters right now though, so maybe after a little more story is written I could see a studio picking it up.
On a different note, I'd totally watch an anime adaptation of Shikimori-San (This Girl is Not Just Cute!) I have no idea how it'd be adapted, but this is one of my favorite romance manga of late. It's just plain cute, and Shikimori is a QUEEN ! An ICON ! Not to be a weeb, but she's definitely Best Girl.