I think most of us wind up self coached if we continue running.
I did do one full year of being self coached as a full time runner a couple years after college. And then went back to my college coach for my last year of full time running.
My first season out of college (coached by John Cook), I brought my 1500 PR down to 3:42.9 from 3:52.4 the previous season. My 800 PR was 1:49.7.
Outdoor season the year after, I trained with Centrowitz/Gags Enclave group.
I got into great shape but only ran 1:50.5/3:46.3.
More mental as I had a personal issue and then didn't like being pulled from the Penn 1500. I ended my racing season mid-May.
I decided to coach myself and train by myself for one year.
I basically just follwed my logs from previous years and tweaked a few things. I didn't have any issues staying focused or doing the planned workouts. Running on my own didn't detract much from my practice splits and my tempo runs were improved as I was just fitter than before.
I was determined to do this.
I wound up running 1:50.5/3:45.1.
Decent.
I went back to Cook for one year.
Got really fit. And had some serious horses to train with like Julious Achon (1:44/3:35 that year for Achon).
I battled a pain in my heal all year and had trouble getting sharp.
Finally, after backing off a lot in mileage and intensity, I managed a 3:42.1.
3 hard years of traing to drop just .8s in just one race.
But you can't say I didn't try to find out my limits.