Easily the most effective for me has been to develop, review, and/or do one action item off a plan to be able to leave the job and work towards something I want to spend my time working on. Knowing I have a plan, remembering it and seeing that it's a good plan, and taking steps on that is a concrete reminder that the job I hate is temporary and I'm not stuck. That reduces the scaries significantly for me.
Then I also like to clean my place, light a scented candle, and read/watch something to make where I live feel cozy, comforting, and home-y. A reminder that even though the job is shit, I have at least built a home that I come back to. Might call a friend and talk it out too - works on both levels.
Thr scaries start for me once it gets close to noon and the day no longer feels young. The feeling that the day is lost merges with a similar feeling about life, which urges me to do something, anything, with my time.
That's when I usually get a burst of productivity that lasts until it's 5pm. The weekend is gone and it's time to enter self care mode. That usually means good food and entertainment in one form or another. As it gets dark I'll start trying to stop time with booze or a bit of weed as I indulge myself with sports or a movie.
I will often go to bed early so I can be all cozy and in a safe space to go down a wikipedia hole, read a book, listen to music and just veg in general.
Once the day is actually over the scaries usually have disappeared oddly enough.