i didn't improve from videos,actually, i inproved from copying and taking references(if you decide to do this,DO NOT claim the art as your own). Specifically what i would do i would search something like "how to draw a masculine dude" go to images,find a drawing i like and copy it,and i'ddo the same with other pictures ,as well. I also heavily improved (and found my artstyle) by copying JoJo, you can do other animes, as well, but i found JoJo's artstyle particularly to my tastes. Experiment, as well, with styles, I thought i wanted a soft, feminine style, and i only did soft,feminine styles because thats what i THOUGHT i wanted, until i started referencing jojo, which quickly made me realize "holy shit this is so fun to draw, i love this style" and thats how i found out i ****ing love drawing harsh, masculine styles, plus,i was never actually any good at chibi,soft or feminine styles. I hope this helped at all :>

U just keep on drawing