Database
[{xp:3,coins:0,level:1,gid:"754542598957432943",profilepic:null,userId:"712947234886647828",username:"CoolUserName1",__v:0},{xp:4,coins:0,level:2,gid:"754542598957432943",profilepic:null,userId:"712947234886647828",username:"CoolUserName2",__v:0},{xp:5,coins:0,level:2,gid:"754542598957432943",profilepic:null,userId:"712947234886647828",username:"CoolUserName2",__v:0},{xp:6,coins:0,level:3,gid:"754542598957432943",profilepic:null,userId:"712947234886647828",username:"CoolUserName3",__v:0}]
Query
db.collection.aggregate([{"$match":{gid:"754542598957432943"}},{"$sort":{level:-1,xp:-1}}])