two ongoing major projects

Define "major".

I think key here is scoping these projects. MVP MVP MVP

OK, "any" I don't believe in scoping, an addtional project, no matter how small, will inevitably drain my focus. About the rest/additional/future I can daydream. But I work actively on two at most (assuming I want them finished, I used to have infamous "more than two projects" periods in my life).

Except for unavoidable fixes/small periodic upgrades of already released games, but that's far less distracting.

Anyway, there is nothing a deadline can't fix As long as you have all milestones and release dates of all your projects written down I supposes, in theory, you could be working on any number of these, I think.