Running can be so frustrating with one injury after another 😔
I know what you mean - I was constantly injured between 2015 and 2019. Achilles, ankle, hip - on repeat. Read 2 books that kind of changed my running life though. Matt Fitzgerald's 80/20 and Chi-Running by Danny Dreyer - I backed this up by doing a weekend chi running course with Irish runner Catriona McKiernan in 2018. She should have had Sonia O'Sullivan's career, won the London Marathon etc but was constantly injured so never fulfilled her full potential - so it became her obsession to go injury free when she started coaching. I'm into distance running rather than the super fast stuff so the changes kind of suited me. I know there are a few really fast lads in here from lurking, but I can't speak to that type of training at all. This is all anecdotal.
Chi Running is a form guide, concentrating on having a strong core and good technique. It's got some mystical bullshit around it, but the basic thrust is breaking down your running form and rebuilding it, along with doing some strength work (less than an hour a week) so you stay injury free. It's about being present when you run too, so you ditch the headphones etc and do your runs with specific form focuses in mind. Some runs its posture and leaning forward, others its foot strike, others about concentrating on running from your core. I found it really interesting. I did it on my own for 6 months and then did the course which helped make a few adjustments. You eventually just run differently and stop thinking about it.
80/20 is about how fast you run and your intensity in training. The mistake most people make, me included, is treating every run as a race, Thinking you need to always run fast to get any gain, which leads to tiredness, which leads to injuries and niggles. The reality is you only need to do about 20% of your training at any intensity and the other 80% can be done with relatively low effort. It's built on top of old NZ coach Arthur Lydiard's methods. If you want to run faster, run longer slower. It's counter intuitive, but I guess the idea is that you get all the aerobic gains during the 80% and feel really fresh so get a huge amount out of the 20% of intense sessions as you can really push. A little bit goes a long way etc. Hardest thing to get over is fully embracing slow running I found - that's still an ongoing process.
Not a coach or a doc - but I was just as frustrated about constant injury. So I really looked into it. Not had an injury that's kept me out longer than 3 days in 4-5 years (touch wood). Hoping to run a 50 miler in September.
Hope you catch some luck with it - i'd be lost without running.