Pay the transaction fee only once for withdrawal after transferring funds to the same platform. For example, you have 0.3 ETH in Telegram, 0.7 ETH in Twitter, and 1 ETH in Discord. You can transfer 0.3 ETH in Telegram and 0.7 ETH in Twitter to Discord's account and then transfer all the 2 ETH in Discord 2 to your wallet. In this case, you need to pay the transaction fee for the withdrawal only.