Your hair may have become a higher porosity, which could explain the extra tangling and dryness.
I know folks sometimes recommend porosity equalizers like from Zotos/Roux (?).
What is your regimen like?
Yes, I've seen lots of relaxed ladies swear by Roux porosity control or French Perm Stabilizer products. And I also agree that high porosity seems to be an issue here.
Tbh I’ve always been super low maintenance with my regimen. I wash, condition, moisturize and bun my hair every week or two depending on how it feels. I don’t do much else unless I want to straighten it which is like once every two months. I still use the same products I used when natural (Annabelle’s leave in, Elucence MB conditioner).
I also detangle in the shower.
I honestly believe that you can still keep your simple regi but maybe just switch out the products you use. You may not even have to switch them all out, only certain steps. Maybe you can now wash and condition w a porosity control product and then moisturize and bun with whatever you use now. You can also use white vinegar/ACV to lower the pH of a your hair in order to help close my cuticles.
When was the last time you clarified? Whenever I run into an issue, I start the slate clean by clarifying and then DCing with protein and moisture.
Also, do you DC? Maybe you can add a weekly protein + moisturizing DC somewhere. I don't like to do one without the other, my hair works best when I use protein and moisture together instead of separately. The protein helps the hair accept moisture better.