Where to sell my Mountain bike?

[Nelly2020]

I wanted to sell my mountain bike and put the money towards a new one, but obviously would have to sell locally, I put an ad up on gumtree, but im just getting lots of fake buyers and spam now since putting my phone number on there , people are as*holes ¬¬, so I have had to take it down. Unfortunately the calls had not stopped since, now having to field all my calls through here so not willing to put my number online again Any other recommendations for sites for for selling a second hand bike please?