and without burning ones self out? or crossing ethical/personal boundaries?

I love side projects so much and hate the grind of day-in-day-out repetition, I just became a contractor.

One thing you can do is try and find AOR clients. For example, I have a very strong relationship with several other agencies and one even keeps a desk for me. Which at times feels like Im just working for them.

Then I can bail or chose to work on whatever. 2 years ago I joined a start up for some time. etc.