How to Manage Chronic Achilles Tendonitis for Runners

I have been dealing with a nagging pain in my Achilles for over a year now. I am looking for how to manage chronic achilles tendonitis for runners. I have tried resting for a few weeks but as soon as I start running again the pain comes back. I am based in the UK and I really want to get back to my local parkrun.

I have started doing heavy slow resistance training which I heard is better for chronic cases than just stretching. I am also being very careful with my shoe selection and avoiding anything with a very low heel drop. I am wondering if I should be using a heel lift in my daily shoes to take some of the tension off the tendon.

Has anyone here dealt with this long term? I am curious if you found that specific exercises or treatments like shockwave therapy actually worked. I am trying to stay patient but it is very frustrating to be limited by such a small part of the body. I would love to hear your advice on how to finally beat this!