Flickering Flames Event
As part of the Cold Snap update, players are now also automatically enrolled in the Flickering Flames event, which contains up to 25 rewards that can be earned while playing the game. You automatically gain Merits when you earn XP in a round, which are then cashed in when you return to Speranza, netting you gear, cosmetic customizations, and Raider Tokens–Arc Raiders’ premium currency.
Since Merits are earned by simply doing anything that grants XP, netting every reward on the track should come reasonably easy for regular players. If you want to speed things up, though, just focus on high-XP situations, such as killing larger ARC enemies like Bastions, Bombardiers, Leapers, or Rocketeers.
Note that you need to have played at least five rounds of Arc Raiders to be eligible for the Flickering Flames event.