An exercise i like is to paint one of my paintings again, but in an (at least for me) unusual size.
It is such a difference to change the standard size. We often get used to a size and stay in that zone.
If you usually paint on 25x25cm (10″x10″) canvases and you could challenge yourself by switching to 125x125cm (50″x50″).
You will recognize how much influcence the size has on your process.