When should I cut back (dramatically) my everbearing mulberry?

I planted a mulberry tree 3 years ago and it finally had some fruit this year…but most of it was out of reach, as the tree is a dwarf variety but it’s still too tall to be practical, probably 12 feet or so. I see different recommendations, some say to wait for dormancy, others say to cut now with abandon, it’s a mulberry, go crazy, it will love it. Does anyone have experience with this variety or similar and have any recommendations? I’m in zone 7a if it matters, outside of DC.