I don't know why it is too expensive to swap on some blockchain especially eth blockchain
Can someone educate me or kindly recommend me one that is less expensive or where I can easily swap to web3 token without paying so much fees
This directly concerns the chain inwhich you are working on. If you have transactions to carry out on the Ethereum blockchain then, you are compelled to carry out the swap on the eth chain without the need for an alternative consideration but if what you want to swap exists on multiple chains then it is ideal that you check through the chains that exits with a much lesser fees and swap it.
If you have option on chains to use the you can consider TRX,POLYGON,CELO,ROSE,EOS, etc. A whole lot of them exists