LOTS of songs. LOTS OF SONGS. Don't obsess over 1 song for 6 months, tweaking things endlessly.
2. Learn how to work efficiently.
3. Also, organize your shit. Keep all your synth patches organized, all your wooshes in the same folder, etc. If you're spending more then 15 seconds hunting for a sound you're fucking up.
4. Learn to play a fucking instrument.
5. Treat your room.
The room you're working in sounds like shit and you can't hear shit properly and that's one of the reasons your mixdowns sound like shit. Build some goddamn bass traps.
TAKE A BREAK. Ear fatigue occurs after listening to the same sound for hours and hours. Goodluck and get started
Cheers!!!