You can try Anyswap for this because Anyswap has a feature that can convert Polygon network to Binance Smart Chain and also ERC20 network to Polygon or Binance Smart Chain, so you can use it for what you need
https://anyswap.exchange/bridge#/routerNice information, I think everyone can learn and find a solution by exchanging information related to crypto, especially with the problem of very high fees on the eth network. and how to change the growing crypto network, good information mate, thanks