I have seen others here suggesting starting with Sweet Spot Base II again. It starts off with VO2max intervals and higher intensity work so that you won’t lose the higher FTP you just built. But also expands on your strength endurance so that you can then enter Build again with a higher ceiling from which to build.
Basically, it won’t hurt to follow Base-Build-Base-Build right now. And since SS Base I is a lot of just Sweet Spot work, you might lose some of the VO2max gains you’ve accumulated but you’ll lose less of those if you enter at SS Base II right now.