Symptoms of an Amateur Track

Sup guys, sorry for being inactive for two days!

I have been interested in music production for 4 years. To get my songs heard more I often had to review other people tracks. I kind of started to distinguish what makes an amateur track and what takes it other level. So here are main points what I think makes a track amateur:

1. Lack of mastering quality
   This one is the most common one. New producers just do shitty mastering because they either suck at it or have shitty hardware. You feel that instrument volume and frequency levels sound unbalanced, there is something wrong with compression or compression is not present
2. Something wrong with song structure
   There are songs that might have "the catch" but it evolves in a weird way. In such cases I believe the person didn't think much about the structure. Music is about repetition and in  most electro genres that repetition should come after the drop. Stick with the same idea through the song
3. Sounds like the creator didn't try hard enough
   Sounds like a copycat of a million songs out there, simple chord choices, repetition without the change, sounds empty. These kind of tracks won't get anyone anywhere, obviously, you don't feel like listening it again because there is nothing else to discover. A good track needs at least 20 hours of production IMO. Intro and outro are needed too, lol.
4.  Sounds like the creator tried too hard and failed
   This one is funny and I actually I see it often enough. It's hard to explain what is wrong. Todays music has to be a bit subtle, a bit cool, mashing in a lot of stuff does not always do the trick, you know what I am saying.. :) Trying too hard kills the coolness.