Asklemmy

Drawing gets a lot easier if you approach it as a muscle-memory skill like calisthenics or juggling - if you can write letters neatly, you can also learn to draw shapes you've practiced. The early exercises in books like Keys to Drawing (Dodson) or The Natural Way to Draw (Nicolaides) introduce ways to practice those skills, and then the rest is "find subjects you want to draw", which can be as simple as watching a video, pausing it, and quickly using that for the exercise. Do that for a few minutes a day for a few weeks and drawing skills will magically emerge.

There are tons of "how to draw tutorials" that don't explain any of this, speak about it conceptually, and tell you to go draw a thousand cubes, which will make you better at drawing...cubes. (There is some point to that kind of technical skill, but it's not the thing to invest in if you just want to use images to tell a story)

For writing, practice writing short stories using writing prompts (I normally use Reddit's /r/writingprompts but I'm trying to find an alternative here) and post them on the thread even if they suck. The commitment is low since it's a short story and you can afford to twist the story to match your writing style rather than the other way around. You'll also get votes and feedback from other members.

I started drawing as a kid, stopped for a while, and got back to it in my teens since I started doing a lot of writing then and wanted to visually depict what was happening as well. One thing that helped me a lot was to not look at other people's art or photographs but rather solely work with what you're visualizing in your mind and reiterate (with many many strokes) until the quality becomes acceptable. Use pencil and sketch with short and light lines. The point here is to develop your own intuition for perspective, splitting an object into basic shapes, and so forth.

I'll also add that it's extremely important to create your own style both for writing and drawing. Make your stuff look good, but always keep in mind that it's fine to have your own quirks and distinctions. E.g. if your lines are a bit sketchy or if your circles aren't perfect that can easily be part of your style.