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My doc likes the solid plastic ones like these: [link]
I have one for each leg. I mostly now wear them when I flare up. At some point with all the stretching, massaging, wearing custom orthotics, and wearing these, I got to an acceptable level of relief. But it does still flare up.
Start doing eccentric stretching.
When you first start your calves will get sore so start slow, like 10 reps with both feet, then after a few days 2 sets of 10 reps, eventually you want to do single foot drops like 3 sets of 15 on each foot, but take your time.
You can also do concentric stretches, like stand on your toes for 30 seconds (each foot)
Stretch your Achilles out. I have something like this that I try to wear an hour or two a day. Currently I wear it at work but you can wear it while watching tv at night. It’s actually for pf but it will still stretch the Achilles.
Alpha Medical Plantar Fascitis Night Splint Heel & Foot Pain; P.F. Brace L4398 (Medium) [link]
It’s obvious but try to wear running shoes that don’t press in the back of your foot. For instance There are adidas shoes where the heel counter is two rigid pieces of plastic on either side of the heel with a soft fabric between then. (Solar boost, I think). Whatever, just don’t rub the heel when running.
Good luck!