Yes, you can lock in Stakedao to boost your earnings. When you lock in your SDT, you will earn 3CRV, CRV, and SDT from the staking rewards. Additionally, you can compound your 3CRV/CRV into more SDCRV, which can help to maximize your earnings. By locking in your SDT, you are also helping to secure the Stakedao network, which is an important part of the DeFi ecosystem.