Target audience - create asset groups vs new campaign

I have a pmax campaign for an ecommerce client with a very good amount of conversion data and with all of the client's products, so naturally there are products for multiple target audiences. Given that this pmax campaign has been running for a very long time, is it better to create asset groups inside it with custom signals and customer lists, or create individual campaigns for each category and target audience I want?

The campaign is dialed in more towards one specific product category. Also, as Austin said in the course, once the pmax campaign is dialed in, giving it different signals won't do much as it already optimized it with the signals it found were good.

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