Levelling up is part of the gameplay loop in Fortnite, XP is what you need to boost your Season Level, which youll just get by playing, while your Battle Pass tier is all about the Battle Stars, which can be earned by completing Fortnite Battle Pass Challenges or the Daily Challenges.
Your total XP - unlocks more accessories for both the Drift and Ragnarok skins in the paid battle pass. Drift is granted upon purchase while Ragnarok is the exclusive Fortnite Tier 100 Challenge skin, so you need to be increasing both your battle pass tier and season level to unlock the fully kitted out version.
So is there a way to level up faster? The answer is yes, check the following tips:
1. Play with your friends in squads, or at least duos
2. Complete the Daily Challenges
3. Buy yourself the Battle Pass and tick off those challenges
4. Keep an eye out for Double XP weekends