A hundred years ago a wonderful slender book was written, "How To Live On 24 Hours A Day" by Arnold Bennett. He suggests getting up early and doing your passion projects before work.
I'm trying to do a bit of that, but it's understandably difficult. I have an easy day job time-wise, but even then I feel like I rarely do my best passion project work at home. Lately I'll wake up at 5 and work, go to the office from ~8 to ~4, and then get a couple more hours done at home afterwards.