Hey I think you're headed in the right direction but you're very outline/contour focused. You've drawn a straight outline of every form on the kitty. Like on the left side of the cat, which is in light, you drew a straight outline and little spikes to show the texture of the hair. Instead, try to consider each tuft of fur and design your outline from the get go to portray texture.

When drawing texture, the most important thing is the outline/contour of the forms. Consider Uncomfortable's example here: https://drawabox.com/lesson/5/1/fur The outline of your cat should be carefully considered tufts of hair, not scratchy lines. This helps you out because drawing tufts is a lot quicker than drawing little lines as you have.

With texture, less is more. You should challenge yourself to use fewer marks to convey texture. I see you've already done lesson two and your sausage textures show you're building understanding but many of them have the same problem: https://i.imgur.com/mvxQWL9.jpeg Like the bear fur on this page, you've overloaded the sausage with so many marks to show the texture of the fur that the fur is lost. It's super busy to look at and I bet it took forever to draw. Uncomfortable demonstrates that you don't need to use so much.

Last thing, and it's a problem for me too, but draw bigger! Draw as big as you can make yourself do it. Drawing little is less intimidating, but pen and ink techniques like hatching are much easier to control the bigger you draw. It will really help you figure out your proportional issues. Maybe even get a newsprint pad like 18x24, they are cheap af.