I watched a video, the other day, by a Youtuber I follow who is also a bit of an art geek. He has recently enrolled himself on a cartoon course and was relating the various tasks they'd been asked to perform on the course.
They reminded me of some of the drawing exercises I'd done over the years I'd been at uni.
One of which was making a series of quick 30-second drawings of random objects. I found a random object generator online and used a timer set at 30 second intervals to draw the objects listed.
Obviously they're largely imperfect and rough-looking, especially some of the things I obviously find more challenging to draw, but it's a good way to reacquaint myself with drawing, make quick visual decisions and learn what areas I should focus on for improvement.
30 seconds is a surprisingly short amount of time to draw some things, which you don't realise until you're doing it.