If you have a wallet's private key, you can import the wallet to a wallet provider of your choice.
Below are a few guides on importing your wallet to popular wallet providers.
MetaMask: https://support.metamask.io/hc/en-us/articles/360015489331-How-to-import-an-account
Coinbase Wallet: https://www.coinbase.com/wallet/articles/getting-started-mobile
Rainbow Wallet: https://rainbow.me/support/app/import-an-existing-eth-wallet