Yes, you can stake CRV after you have swapped for it. You can lock directly on Curve, or you can stake your CRV in other platforms such as Convex, Stake DAO, or Yearn. Depending on your risk appetite and the type of rewards you are looking for, you can choose the best option for you. For example, if you are looking for higher rewards, you may want to stake your CRV in Yearn, as it offers higher rewards than other platforms. However, it is important to remember that the higher the rewards, the higher the risk. Therefore, it is important to understand the risks associated with each platform before making a decision.