If someone doesn't respond to PRP and doesn't want to use minoxidil, are there any other options?

 PRP is effective in 50 to 95% of hair loss cases. Sometimes , PRP needs to be combined with other modalities to produce maximum effects. Minoxidil, both oral and topical, are also very effective with PRP. If one does not obtain results, a more extensive workup on the etiology of the hair loss is needed. Additional therapies include nutraceuticals, micro-needling, low level laser, finasteride, both oral and topical, topical peptides and hair transplantation. Find a hair expert. Ask to see photos.

I assume you are speaking about androgenetic alopecia in this question. If so, anti-androgens, low level laser and hair transplants are options. Scalp micropigmentation and hair systems are cosmetic options.

The answer to your question depends on what you're trying to accomplish.  If you've lost a significant amount of hair, a hair transplant may be your best option.  If you haven't and are just trying to maintain your hair and prevent further loss, finasteride (Propecia) and laser therapy can help.  Scalp micropigmentation can also make your hair look thicker.  I'd suggest a visit to a qualified local hair restoration expert to discuss these options.