Hmm difficult one. Whenever I go through a period when everything seems a bit stale I do two things:

Firstly I remember all the things I’ve wanted to do or interests I have but haven’t got round to exploring, and pick them up and do them. I actually keep a mental list of these things so that I’m ready with them when things become stale around me.

Secondly I look out for new things and experiences and pursue them.

Basically I try to incorporate some new element or perspective into my life by either revisiting something or finding something new.

Don’t know if any of that helps, but good luck 🙂