I'm in my 30s, and I'm planning on taking up drawing for the first time ever. I don't even doodle, but I think it would be cool to be able to do simple concept/placeholder art for my projects. I'm very much expecting to suck at it, but I'm entirely okay with that.

You might try different media if you haven't already, as in, instead of pencil/pen and paper, maybe colored pencils or markers. Maybe even try getting some black paper and trying to draw with white color pencils instead.

I'm sure you may have tried a variety of things over the years, so I'm just spitballing, but also if you're trying to dive into the deep end with more complex drawings, you might revisit and really hone the fundamentals. Fundamentals being like getting clean lines by practicing drawing those over and over till you can get a nice, sharp line (which often isn't a single pencil/brush stroke!).

Once you have those down you may move on to the simple shapes, squares, triangles, circles, and try to recognize how those are put together for more complex forms. It's a tough skill to get down, without a doubt (I'm not some proficient artist personally), but it's just that: a skill that takes not only practice but learning methodologies. One of the toughest parts with drawing is that there's so many methods to go about it to figure out which helps you improve.

I'm also just spit balling but many skills are needing an account if muscle memory.

So with that I'm mine i wonder if you spent 10-20 minutes a day just tracing styles or things you want to be able to draw to develop that muscle memory would be helpful