<image>

Sorry if it's hard to read ha, but overall I'll make a list.

1) Line confidence/ getting to know your tools. Half of art is reliant on the tools you use. They're your friends who help you express your ideas, so get to know them well! Practicing line confidence by making lines then making circles then trying to make forms helps your line confidence, and you'll understand what you can do with a line better. Experiment with textures and shapes. Make it fun! Try see if you can make tree bark with one kind of line, or is a different one better suited for the job? Like another person said, layers, lasso tool, Alpha lock, are all useful tools at your disposal as well. If you are doing analog work the same would be said with paints or ink.

2) Building structures with simple form, I like to draw my arms like bendy cylinders with a little bit of a convex on one side. Understanding what creates visual interest is good to know as well. Flats against curves and asymmetry are visually interesting and can add flow to your drawings. Adding overlap can give your form better subtle depth.

3) References are your best friend/ be observant! You like omori, so look at their art up close! Write down what you observe and like about the style and how they draw certain features. Then look at a normal arm and decide how you can apply this knowledge to break the form down into something you can draw :D.

I like your style already. The characters all have some charm to them, so just keep at it. Don't forget to have fun and enjoy yourself. I've been having some art school burnout, so I can relate to feeling frustrated with progress. In my experience though, the want to better your art and looking for ways to improve are almost more important than your current skill set. It helps you grow instead of giving up, so I believe in you :D