For real writers that earn their living through writing, there is no such thing as writer's block. They start each day knowing they have to sit down at the keyboard and start typing, every morning regardless how they feel.
If you feel blocked because of too much photography, the solution is to lay off the photography for a short break. Even a few days can do wonders.
If you feel blocked because of too little, the solution is also simple: Start shooting more.
If you are bored with what you photograph, figure out what you find interesting and challenging, and work on that. If it is your hobby, you can decide what, and how much of it, you photograph.
Many people feel more driven when they have a clear project that they work on. PAD, PESO, monthly challenges etc. can and do help. Or you could define your own project. I think it must be meaningful, and hopefully lead somewhere.
As for me, I do get bored sometimes, and then I try something new. I built my first 4x5 pinhole camera over the past two weeks, simply because I was a bit bored with the usual sharp, contrasty stuff. It always helps if one measures one's progress. Without progress, every endeavour is essentially a hamster running in its exercise wheel, and even exploration can become a bit stale.