What is the best way to get rid of festoons? My doctor made them worse after a blepharoplasty.

Thanks for your question and sharing photos. It would be good if we could see before and after photos. There are many, many different ways to do eyelid surgery, but any lower eyelid surgery can, on occasion cause  prolonged swelling in the area. This is for two reasons, first, the blood flow to the operated area is increased. Second, the lymphatic and venous drainage pathways of the area have been disrupted from surgery and need time to restore themselves. At 4 months out, you have a few possible treatment options, but a physical examination would really be necessary to make a complete recommendation. There are some anti-inflammatory injections, you can try lymphatic massage and eye exercises, amongst other things.
Tetracycline (a relative to doxycycline) has been reported rarely as a treatment for festoons. It is an antibiotics that is a sclerosing agent, which means it causes a chemical scar reaction to prevent fluid build up in tissue where it is injected.
You are still in the healing stages of your surgery, but I think there are probably still some things that can be done to help speed along the process. As always, even if you get a second opinion, make sure you keep in touch with your treating surgeon. Warm regards.

I'm sorry your having such a challenging post operative experience.  It is not uncommon to experience post inflammatory changes under the eye area at 4 months post.  Swelling  can occur up to 6 months post surgery.  It is best to wait until 6-12 months post surgery before operating on the same area.