Advanced FB advertisers, what's the best account structure you're using these days?

I've seen experts recommend a single campaign strategy, while others suggest running multiple campaigns. What do you think is the best approach for a clothing brand with a $600 daily budget?

I lean towards the multiple campaign strategy, running 3-4 campaigns that complement each other. However, I struggle to find the perfect structure. I've tried a DPA campaign (ABO with separate adsets for different product sets), a "crazy method" campaign that has been working well for 3 weeks now, and both a CBO and Advantage+ campaign using the same creatives. This structure performed really well during the last week of December but started to decline as we moved into January.

I'd really appreciate any suggestions!