Can you guys give me tips on how to make a good lineart? my sketch turns out well for my skill level imo, but the lineart is so flat and the coloring also feel so bad. please give me an advice

try to add line weight, and where the lines meet it is usually thicker

I know a really good tutorial but it is in spanish so I cant help with that :/

Also there is an alternative to lineart if you want to try, you can just paint bit that is an entirely different style and maybe you dont want that