You can place an ad here subject to the advertising rules. As for finding a knowledgeable keeper, I don't imagine finding that keeper will be the hard part. The hard part is going to be letting go of a beloved pet. Those emotions can cloud your judgement and lead you to disqualify all candidates. So, I suggest you make a list of must haves (e.g. must have experience with large constrictor snakes, must have a 4 x 4 x 8 enclosure, must not exploit their snakes for attention on Youtube, etc.) and sell the first person that checks off all those boxes.