Over the past few years, I have been buying a little ether tokens, as well as BSC.
I have quite a lot of them and here I find a very expensive gas for transactions.
What is the cheapest way to exchange tokens (ETH/BSC/POLYGON) for Bitcoin?
Exchange it on the Exchange which have smallest BTC withdrawal fees could be suitable solution.
Check it here,
https://withdrawalfees.com/coins/bitcoin make sure the exchange is reliable.
Also make sure the exchange already list BSC/ETH/POLYGON first.