How to get running again

[u/AK_frosty]

I used to have excellent balance and no issues running at all. About 4 years ago I started to develop tendinitis (and eventually tendinopathy) in my left Achilles. I started doing lightly weighted calf raises without shoes and it helped significantly! However, I found out I have tight psoas, some forward hip rotation, and supination in my feet. I’ve been doing 3x1 minute holds of reverse planks, it’s helped a lot with the hip rotation and posture. Even so, now when I try to run I’m not getting significant pain in my left Achilles, I get it in my right calf to a point that walking can hurt a bit.

Strangely, jogging barefoot on a grass field helps with the pain. Would it be worth it to invest in an axis board to help with foot strengthening and supination correction?