@eclipsezeromh Unfortunately not. You can leave the Gold Track unlocked if it is not in your interest at the moment to unlock later (which you did) but on a Previous Mission Pass you will be unable to advance it.
Hopefully within the next few days (or weeks) Sega will hand out some Star Gems as rewards. Otherwise if you are interested in making it back up, the Battle Arena, Buster Quests, and Casino can provide you with some Star Gems. The Battle Arena will definitely reward you some for reaching specific ranks but all of those have limited exchanges that will get you a total of 240 Star Gems (100 from Battle Arena, 100 from Buster Quests, and 40 from the Casino).