I’ve been able to get my trees back onto a yearly cycle. At least some of them. You’ll want to aggressively prune them the year they produce fruit. They get into the every other year cycle by overproducing one year, and the next year not having the energy to produce. You can sometimes break this cycle by keeping them from overproducing by pruning. Just be prepared for a huge amount of vegetal growth the next season, and again prune them way back.