First of all, you need to identify a centralized exchange platform (Binance, Buda, etc) where you can send your current assets.

Take into consideration that Arch assets such as Polygon Web3 will not be available as a currency in a centralized exchange app, so the best way to do it is to exchange the assets you want to withdraw for USDC and send that.

Also, check if the network in which you have your assets (Polygon or Ethereum) is compatible with the network in your chosen centralized exchange app, since sending assets from one network to another may result in loss.

When you are ready to send, you will be presented with the following menu:

Here, the recipient wallet is the must be your centralized exchange wallet. To find this one, here are some tutorials on how to do it quick and easy:

https://www.binance.com/en/support/faq/how-to-deposit-crypto-to-binance-115003764971

https://soporte.buda.com/es/articles/2379050-retirar-dinero-desde-tu-cuenta

Finally, you can just withdraw your assets from these centralized exchange websites in a quick a safe way.

Disclaimer: Arch is not in a partnership with any of the aforementioned centralized exchange apps and there are a variety of other options.