do you use the same products or rotate?

I have a lot of products and some work better than others so I'm trying to figure out if it's better to just stick with the ones that work the best or is it better to rotate them? Is it true or a myth that some products stop working? Any advice?
Attempting to grow out years of tight spiral perms, so not sure of my hair type? Multiracial medium texture but very thick spirals, maybe 3B, maybe 3A/B? It's chestnut brown and down to my shoulder blades, bra strap length when wet or straight.
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