All social media (Instagram, Facebook, Twitter etc) is helpful but it is my experience that you need a webpage or blog to direct people to. I have read articles about this and what it does is allows people to go to that site and learn what they need, be able to contact you and the site can be shared even when you are not posting things. I am not computer savvy so I started a caring bridge site (caringbridge.org). It is simple and free and you can put journal entries to keep followers or visitors updated on your health and progress. I also made 5×7 cards and placed them at businesses I frequent, with their permission of course. And I have a magnet on the back of our truck and a tire cover on our Jeep with my need and my cell phone number. I have had very little traffic from the car advertisements but it only takes one. I did have one person take a photo of the magnet and post it on FB and got a call from that (the person was denied). Whatever advertising you need to be consistent with sharing your need, your story and educating people about kidney transplants, living donors, dialysis, and the size of the waitlist.
Good luck…and don't give up!