Unfortunately, this is not possible. As soon as you have chosen the 1.5X Freezer, you will not be able to extend that position to 10 years, because you have frozen your DFI On-Chain. We at Cake DeFi have no influence on the On-Chain freezer and can not make any changes to it.
For more Information about the Freezer Program, please check this article: Freezer Program in Overview
Can I extend from the 1.5X (5 years) Freezer to the 2X (10 years) Freezer?
