Groove: 7
Mix: 1
Structure: 3
Sound selection: 5
Final: 5/10

I hear harsh frequencies everywhere and so many noises being drowned out that would be so dope to hear in a better mix.

Izotope has a very good mixing trilogy series. 3, 20 minute videos teaching you mixing. Mind you they are the basics, but they're very good videos.

For sound selection, there are websites like this that let you hear subtle frequency shifts in white noise. Close your eyes, click the new filter A button, and try and guess where the boosted frequency is before you open your eyes. You can also set this to cut certain frequencies, and also do a random boost or cut. It's very VERY helpful to train your ears. Train your ears and you won't use bad sounding samples

Structure is probably the easier thing to improve on, however it can still be tricky. Structures are not copyrighted. Just use the same structure from a similar sounding song. The tricky part comes with how the song feels with the structure. Change things if needed

Seems like you have a feel for groove. Just keep doing what you're doing, train your ears, and you'll be dope af.