Very much this.
Here's a link to the reroll guide.
You have almost two weeks before the next raid event. Unlike Advent events like this one, raid events are newbie friendly. Try to find yourself a 100% Eidolon, or two SSR Hime of the same element, or one core Hime of some element. Anything you gain from this event will not compare in any way to a proper start of an account.
Also, please don't use Kaiser Dragoon as you main Eidolon. While they have good stats, they effectively don't have a passive effect so... literally anything will help you more.