Ethereum has small block size but the transaction that needs to be confirmed was more than what can be processed by the block. that makes lots of transactions got stuck in queue. People are speeding their transaction to make the block to process their transaction as it will be placed as a priority transaction by the block. This is triggering the fees to increase as fees calculated by average transaction gas fees in the blockchain.
The cheapest one to buy this from binance. I were sending WETH from my ronin wallet to the binance directly and it's very cheap.
Have you checked it before? When you wanna withdraw your ethereum and there will be some options appeared. You can choose WETH on binance to withdraw your WETH to your ronin wallet.