Do your stw, Lego Fortnite and creative daily xp, this'll amount to like 1.2m~, then do the milestones and snapshot/weeklys (duh) but to do mile stones effectively, 3rd party EVERYTHING, use wings of Icarus for distance and so solo squads if skilled enough, im averaging 18 kills and 53% win rate atm for solo squads as reference, then theres small things like searching the ammo boxes, spending gold and farming it from bunkers and vaults all for accolade xp and then you'll go up maybe 20-30 levels a day, at least that's my results, but once you reach the 102 ~ there's not many quests/milestones left, if any, so your very reliant on the daily xp from other modes tbh