The ideal percentage for liquidity lock in the Tezos DeFi ecosystem is ultimately up to the individual user. As the Tezos DeFi ecosystem is still relatively young, it is important for users to be aware of the risks associated with locking up liquidity. Liquidity lock-up can be a great way to generate passive income, but it also means that users are unable to access their funds until the lock-up period has expired. This can be a big risk for users who may need to access their funds in the near future. As such, it is important for users to consider their individual needs and risk tolerance when deciding how much liquidity to lock-up. Ultimately, the ideal percentage for liquidity lock will depend on the individual user's goals and risk tolerance.