@0st Athletes who really overreach and have a long training history can often succeed when switching to minimalist programs because their body needs the rest
and they've worked hard to build a huge baseline in their performance.
For most of the rest of us, the baseline conditions haven't been met for this scenario. That said, it takes a lot less work to maintain progress than to make it in the first place, so no you won't lose your gains if you take some time to change things up.
Instead of looking to "less" or "more" as a silver bullet, take a look at the factors you have control over, and find good places to take logical steps. If you've been dieting a long time, take a few weeks at maintenance. If you've been doing a lot of hard and long runs, shift your focus to getting in a lot of easy mileage. (I swear my recovery skyrockets anytime I increase my moderate paced cardio). A more flexible lifting schedule sounds like a good idea. See what else you can change, especially if you can find opportunities to eat more, sleep more, etc.