Add some ETH to your Base wallet. You can do so with the following options:
1. Send ETH to your wallet with exchanges (example: Binance, Coinbase, etc).
Select the Base network when withdrawing from the exchange of your choice.
2. Another option is to use a bridge. You can use one of the following options:
Official Base Bridge: https://bridge.base.org/deposit
Orbiter: https://www.orbiter.finance/
Stargate: https://stargate.finance/
To use, connect your wallet and select the originating network you’re bridging from, set Base as the destination network, and enter the amount of ETH you wish to transfer.