Hi, as daniel9 just said, if you’re living in Switzerland the only way to avoid fees to topup is to useTransferWise (my referral link: https://transferwise.com/ae/julienm107). You can have a look on this topic for more info: SWITZERLAND - Free top-up methods --> working method (TW)
It’s easy and fast. You just need to create a borderless account and order a card. The TW card has swiss IBAN so you can send your money for free there, then topup from Revolut through this card (also free of charge).
Hope it will help you