You may wanted do a "reset" on your hair. Clarify it with a clarifying treatment or a cone free sulfate poo. Follow up with a DT, preferably one with a little protein.
Then start adding regular PT's and DT's to your routine, as well as sealing moisture in with an oil. (Put a few drops of oil into you hair, concentrating on the ends, before applying products.)
Technique can be a HUGE factor, so you might read through the techniques and try switching it up. Do you plop? Diffuse? Etc.
Certainly many of those things can change your hair - as can plain old aging. And it's true you pattern may just be different now. But it's possible you are over-conditioned, have build-up, need more protein, etc. Those are all common issues with fine hair, so you may have some luck with fixing those things!
2c/3a/3b, Fine/med, Dense, high porous, & normal elas.
Lo-poo - Renpure Keratin, SMR, Giovanni SaS
clarifying - mix Johnson's H2T with low poo
Co-wash - Suave Nats. clar. or coco.
RO - GVPCB, Ion Eff. Care, TN.
LI - SMR, Cure Care, or RO
Seal - MO or Jojoba
DT - + honey, ACV, & EVOO to SM masque & GVPCB
PT - Gelatin!, CNPF
Styling - FSG, AIF, BRHG, LALS/PS, GF curl spray gel, SM Souffle/Smoothie, LOOB
Oils - MO!, EVOO, jojoba, GSO, SM Elixer, EVCO, VO5 Hairdressing