When I got unhappy with my paintings and felt stuck for good... I just used white, yellow,red and blue and mushed it on the canvas panel with knife and fingers, before that substance spoke to me. It turn to be a fire-bird. Childish looking but from my subconscious. This was the first time crisis.
Second time finished 2 weeks ago and lasted around one month. I felt very much down...
What I am saying here you need to switch to your right side brain and stop critics that is coming from the left side of the brain.
There is this exercise I read and I tried that you can use before going with paint or just when you had a rough day...
Take a pencil and piece of paper. Find the object. Look at it. Research its shape. Look at it again. Now watch the object and draw it on the paper WITHOUT looking at the paper. Try to repeat every line Be honest with yourself and do not peak at paper. Finish it and check what you got. Do 3-4 different repetitions of the same object.
Usually the first available object is your other hand that does not hold pencil. It can change shapes that make it more fun.
I got funny weird abstract and nothing-looking-like-hand things... but it helped to start thinking about drawing/painting again.
So this exercise causes right brain to work and shutdowns left brain that likes to critique and be hard on yourself. Exactly what we need for painting - embrace our right brain!
Exercise number 2.
Now Look at the object again. Research it shapes. Now draw that object on the paper by truly seeing it and constantly verifying that you draw exactly what you see and not letting left brain to even tell a single word to you.
Compare both drawings.
Sometimes something bothers and stresses a lot so sometimes dark theme painting even a cartoonish ones are the way out. OR May be it will work from the opposite for you and you just need to make absolutely the WORST painting in your life. Intentionally.
Hope something of this will help. Get better. You are strong person and you have wonderful paintings. We all need a break sometimes. 🙂 Sending you a million hugs!