Yes, you can still earn a yield for your Gorples Coin even after the 70-day Gorple Games period ends. But not using the simple mode or expert mode dApps. If you are familiar with liquidity providing on decentralized exchanges like; Uniswap/Raydium/Camelot/Pancakeswap/Aerodrome, then you can still earn transactions fees, from providing Liquidity.
If you do it this way, you would have to manually pair your Gorples Coin with ETH or SOL depending on the blockchain network you are providing LP on, similar to the process of providing liquidity via the expert mode of the Gorple Games.