I think it's already been mentioned above, but if not, you might add an apple cider vinegar rinse once a week. More often can make it worse, but I find an occasional one helps - I usually don't remember to do one every week though.
Just massaging to stimulate the scalp, even without oil or anything, seems to help mine. My scalp and I've also been enjoying using a little flat shampoo brush to massage scalp and loosen debris (sorry if I'm repeating myself).
2C/3A/3B - mod. CG, med. to fine, normal to low porosity/normal elasticity
Current Main Rotation: MG217 medicated, GTTT or Aim2Health 'poos as scalp needs, YTCarrots or Elucence cond., Spiral Solutions Protein Trtmt & Deeply Decadent Cond., CJCCCC reg or lite, KCCC, AO Mandarin Magic, Giovanni LA Hold Hair Spritz + lots more, sporadically
HG Method: Super Soaker + Smasters-ing, brief upside down diffusing then clips or clamps & air dry. Blend gray w/henna glosses