It’s too bad you can’t get in another race, but you scored a few PB’s recently which is good. So you’re on holidays for how long? Are you going to be away somewhere? You can work out on your own by putting together your own workouts. Be sure to keep some tempo work in there to maintain fitness. Perhaps you could put together something and we can all comment on it. You have good enough awareness of training principles to put together a few weeks of training for yourself.
The fact that your coach runs a general 100-200-400 program isn’t so bad. You’re young, and there’s no need to get overly specific at your current level. When you’re getting into the 10.7 area or better on a regular basis, then maybe it’s time to start specializing.
When it comes to whether to leave or stay with your current coach next season, that’s a decision only you can make, but ask yourself the following;
Who is going to do a better job of coaching me?
Do they have a good sized and competitive training group? Sometimes a good group of athletes to run with can erase the shortcomings of a “basic” program. There is no rocket science in the Jamaican training programs, but there are big groups that have a lot of fun and compete hard!
Just try to know what you’re getting into as well as getting out of when you consider changing.