Depends how urgent and ready you are in FAR. I would recommend keep up with REG and at least do one test per day while studying FAR, or whatever portion that makes you feel you can still be fresh with REG
Chances are new seats might pop out here and there from time to time, as economy opens up. Keep checking and you might find a seat. If you do, just don't expect it will give you prep time. Like maybe 48 hrs. So just keep refreshing yourself.
If you don't think you will find a seat before July 30 for REG, do you really think they won't cancelled your FAR also?