You can use hardware wallets like Ledger and Trezor Browser wallets like Liquality and Portis Mobile wallets D'cent, Math and defiant.

Some sidenote: Sovryn is built on RSK, a Bitcoin sidechain secured by the Bitcoin network. The native token of RSK is RBTC, an exact 1:1 BTC peg. When you transfer bitcoin into RSK, your bitcoin is locked and the equivalent amount is released as RBTC on RSK. Using RBTC, you can lend, borrow, and trade on Sovryn. In addition, all fees are paid in RBTC, so you don't need a separate asset just for transaction fees.