You could try switching to CEL Cloma-Plex or SNS Optimize-T while taking a break from M-Test; both of those are great products as well.
I never take breaks from M-Test myself, but I did in the past and I'd realize I hadn't really gotten used to M-Test, I had just gotten used to the way I felt on M-Test in that it had become my new normal, and it would take taking a break to make me realize how much better I felt when I was on it.