Yeah, these periods happen. And they can be seen as mental recovery as well as physical.
Lots of ways to go around it. Actual athletes usually move away from competition movement/efforts/skill practice entirely to freshen things up.
Personally, I like to use new exercises/variations are to automatically lower intensity (not as skilled motor-pattern so less weight can be used). The newness also means you’ll see the weight go up quickly too which is nice if you’ve been grinding away on your usual main lifts. Examples might be pin or front squats. Floor or push press. Opposite stance deadlifts. Paused lifts. Complexes.
Other alternatives are just dropping intensity or volume by set amounts (which you’ve already clocked) or emphasising different parts of your program (Emphasise the secondary movements and cruise on those barbell lifts, not even looking to progress then).