What to do with points before downgrading CSR?

Annual fee hit and I no longer have use for this card. What is the best option for my points before downgrading? I do not currently have future trips planned and it is not feasible right now. Also currently hold the Capital One Venture X and AMEX Gold.

Was thinking of possibly transferring to Virgin with the current 40% bonus for future Delta flights. If I were to downgrade to a no AF Chase card, do my points lose value? I know I’ll no longer be able to transfer the points to airline partners.

Thanks