With the pain, adding extra cushion under my tailbone has helped. I also found if a sit in a chair with a back helps tremendously because it supports my back. I still try unassisted meditations but my back still isn’t in a place to do that. In my opinion I would rather meditate in an unorthodox space and be able to focus completely then sit on the floor and battle with focusing on my pain or the meditation
I find that first thing in the morning a cup of room temperature lemon water cleansing your system helps your focus. Starting with Deep breathing exercises really helps with focus and concentration.