2A Powerlifting: How Much Variation is Optimal?

What are the best ways for a type 2A powerlifter to get enough variation in programming while staying on track for setting PRs and for PL performance every 3-4 months?

Should DE training be part of a realization phase, or integrated across phases? How many different methods generally need to be cycled through? What are the most essential go-to methods that 2As powerlifters should cycle through.