Everyone hits walls, this is why having a solid co-GM helps. I have been keeping a game running for over a year, and sometimes I just hit a point where I stare at the screen, devoid of ideas or creativity. You can always takea few days away from it until you hit some inspiration, but don't be afraidof ssharing your concerns with players and see if they might have some idwas they want to try or even just chatting OOC can help. I can't count how many times I was on the ropes and then somebody I was talking to got me excited and inspired.

Another thing that helps is if you're still into your game idea, try writing something that's planned for later and see if that doesn't help get you past a certain scene. You could even consider an OOC thread game/ exercise involving your players and do things like a character opinion game, a goofy fanfic, some in-universe behind the scenes post, or even a player survey. Don't fret about being stuck, just come back to it with an open mind and without pressuring yourself!