I've been doing the same for the last 3 years, albeit not on the same scale. I contract every 6 months and then take a month or so off until like you I find my brain starting to feel neglected. I try to fit in a few weekend trips to cities during those 6 months.

I'm a technical PM so I tend to have to be on site for contracts and yet to find a remote PM role. That aside though I'm getting back to more coding these days so hope to be able to work remotely in the future.