Back to your art...

When you can, make time for it.

If you see something that doesn't satisfy you, think about ways to solve it - eventually, be bold, and trample your ego to take on a course of some kind on it.

Perspective, for example, doesn't take much... any good book on technical drawing usually covers "technical perspective" more than deeply enough.

Remember that there are, really, no "cheap tricks" - just things that work for you and your style, and things that do not.

Also, all techniques are just there to be learned and used.

Try to always keep a goal that you can reach inside your despair horizon, the length after which you lose faith in completing projects.

If you are down, that length can be quite short, but doing things helps stretching it back to normal.

Treasure constructive critics and ignore obstructive ones.

No matter what keep going on and, when you can, go back to your art.

Nobody else is really going to really understand it, but it doesn't matter - as long as it yours.