i want to migrate my website with bsc network smart contracts to other polygon ethereum and 3 other networks

I want to migrate my site from the bsc network to the polygon network and I have a smart contract that needs to add 3 FUNCTIONS the same already works on the bsc network. But I want to migrate to the polygon network and etereun and on the bsc again the contract with the 3 functions . I have the source code of the front end and the smart contract that goes on the site .ppr please give your offer if you really know how to work with blockhain and solidy.
I only release some milestone after the contracts are updated and on the network it is tested and integrated into the site so I can test and see if it works