Someone already answered this but you can list them on Fameswap (fameswap.com). Usually accounts that are being sold go by this formula: [amount of followers] x 0.01= price of the account in $. So if your account has 150 000 followers then it could be sold for 1.5$k. HOWEVER this is not always the case, niche accounts are usually sold faster and at a better price range as they serve some kind of monetary value whereas 'memes' and 'funny videos' hold little to none. So you can always list you 150 000 follower tiktok account for around 1.3k or 1.2k.
Also it depends on how quickly you want to sell it as lower price = less time waiting. I was doing this for quite some time and on average accounts with large following listed on Fameswap go anywhere from 1 month to 4 months. Hope this helps.
Slava Ukraini
