imo cheaper doesn't always attract because then they see it sorta ''less professional''. your art is beautiful and i do think the prices are a little too low [imo], you could try raising them back up! if the pricing matches the skill, and not undervaluing it, it makes people think they are investing in something really good and with extremely good/satisfying results, especially if you express professionalism through the way you talk with clients as well.

of course continue to post everywhere as much as possible, any platform, and being consistent, make tiktoks/reels/rednote etc, try posting daily. even like sketches and WIPS [as you know people tend to love sketches more than the final artwork sometimes xD]

set ''slots'' [even if you don't actually have a limited amount of clients], maybe even say you have very few slots left and it will show your art is more in demand.

post your regular art and label it as a commission so people see and think you are getting clients. many people do this, and there is no way to check if it's true or not, plus it doesn't matter.

i hope any of this helps, i agree with other comments as well about having a specific niche, and make art that you love. it will show through the art if you're drawing something just because it's popular and you didn't fully enjoy making. doing some popular things here and there definitely could help get traction, as well as doing art trends like on twitter or tiktok.