Mixdowns are a skill that can take years to figure out right and honestly, a lot of people working on a professional level will send their tracks off to be mixed and mastered by someone else. That's how difficult it is to look at a song you've been slaving away at impartially. Plus, mixdown quality can be largely dependent of the quality of your equipment (A/D Converters, Monitors, Soundcards, and Channel Strips), the acoustics of their room, or quality of their headphones and it's not uncommon to find people who are learning struggling to get that balance right simply because they don't have the gear or space to do it. I've been doing this for a while and easily the hardest part of my mixes are the things that I talked about. Getting the bass and kick to sit right and making sure the high hats sit right in the mix.

Good thing is that for this early you seem to have a really good knack for arrangement and construction. The rest will come in time. There are so many good YouTube channels that will give you help on mixing problems. I personally like this book called Mixing Audio: Concepts, Practices, and Tools which I'll reference pretty heavily when working on my mixes. I find it helps a lot just to be able to turn to a page to help me get the sound I want.

Some techniques that have helped me and that I've had to learn the hard way:

• Sidechain compression on the bass with the kick in light amounts to give the kick and bass space to work together.
• Kick Drum tuning to make sure they are in the same key as your bass so there is no clashing.
• Spectrum analyzers so you can see overlapping frequencies to better understand what frequencies need to be cut.
• Putting certain parts like the bass and kick in mono to cut down on low end messiness.
• Panning high hats to the left and right so they aren't so central in the mix and making them sound more natural.

Personally, I'd recommend giving this a read.
https://www.residentadvisor.net/features/2010
They've got a pretty solid series on mixing fundamentals that are worth reading as well.

But like I said, I really dig the tunes. Wouldn't mind giving this one a shot at remixing if you are ever interested. I just think constructive feedback is really hard to come by on here and thought it might be helpful to you to give some. Hope it helps. Like I said, I dig the tunes and I'm excited to hear more. Your output is impressive! Keep doing you.