Every other sport and discipline: constantly work on your technique over time to become as efficient as possible.
Running: forget about technique.
I get that tweaking technique can cause the impact load to be redistributed differently in the short term and that might cause issues, which won't make you hit your short term goals.
However, anything you can do to become more efficient is a good thing. When has anyone ever said that becoming more efficient is a bad thing. Oh wait, that's the social herd mentality of the running community because nobody wants to give up a year of running to relearn how to move.
You probably need to work on mobility, flexibility, and strength while doing form work, especially after a run. People always leave that part out, which is like going to a chiropractor only to have your lousy muscle tension pull your joints back into place. Do the work and keep the long term goal in mind, which is to run faster for as long and as healthy as possible.