Please add what works for you. Here are a few that at times work for me:
Take one step/one day at a time
Meditation, mindfulness and deep breathing
Exercise
Art, creative writing or journaling
Letting go of what we cannot control
Grounding by placing bare feet on the earth
Try to focus on what is going right
Compliment yourself on what you’ve accomplished
Doing something nice for someone
Take action to get some things done so there’s less on to do list
Remember that you’ve got through it all so far so you can keep on getting through
Take a break; rest or watch a movie or read a book
Go out into nature
I notice I really need to slow down and simplify much of the time
Get rid of clutter