1. You should focus on making music more than fixing mistakes
As a beginner I always thought that working more and more on a track to make it sound perfect was a good idea 'cause then I wouldn't have to feel bad about some mistakes in the track. Truth is, you always do mistakes at the beginning and you should let it be into your process. Time fixes stuff, and people can help you fix that aswell. But more importantly you've got the time to do it. In my opinion, it's better to do 10 tracks with a lot of mistakes in them but with shit tons of different sick ideas than 3 tracks that don't have that much flaws but finally didn't teach you a lot of stuff.
This is the kind of stuff that works in the first months (or on a year depending on the time you take to produce). You'll know when it's time to focus on what's wrong (if its still there!)
2. Connections, How to do it and why it is important
Like maybe a lot of us now, you're a kid doing music on Soundcloud like millions of others. You're probably wondering 'why does this guy encountered succes without a lot of followers', or 'how did he collab with XXX'. Well it's mostly by talking, reaching people that would seem unreachable.
Of course you don't have to rush it, and more importantly you shouldn't spam your links around or ask for feedback to anyone you meet. Rule 1; don't be a dick. Just try to be social, and actually care about what the other is saying to you, or what you'll say to him. By building a relationship it'll be easier for you to ask for favors or even to give favors (which is probably the most awesome part of that kind of relation!) (and being honest is even better, a lot of ppl do it by interest and I guess that's easier to see when its the case. Try to care!)
3. Mixdown
Something I wish we would have told me when I begun : Loud =/= good. Actually, the lower your mix is, the better it'll be. It'll sound way more clean, you'll have more space, you'll be more precise, it'll be funnier. You can exercise yourself by trying to do a track that won't go over -6 RMS for exemple, or lower every tracks in one of your old tracks that you don't need anymore. It takes some practise, but once you've got it, oh man, music will be so much easier!