How to order and retrieve data with a mongodb query?

Question

I'm trying to make a query to my teams app that do this:

1. Create a function that repeats in a certain time - DONE

    var now = new Date()
    var timeToEndOfDay = new Date(now.getFullYear(), now.getMonth(), now.getDate(), 23, 59, 59, 999) - now;
    if (timeToEndOfDay < 0) {
         timeToEndOfDay += 86400000; 
    }
    setTimeout(async function(){
        // the mongo query will be here
    }, timeToEndOfDay);

2. Get the user with the most votes for each team (the team is the value of the user_team_nickname_at field) - Half Done

3. Assign points to each of those users - NOT DONE

Note 1: if the user wins 2 times (the user can do a post with a team and then change a team and post, the points will be assigned to the post that had the most votes, therefore the next user in votes will win

Note 2 the user_team_nickname_at right now has 100 'teams' but this count is dynamic, eventually will have more 'teams'

Mongodb query

    const posts = await Posts.find()
    .select('user_team_nickname_at vote_up userid')
    .sort({vote_up:-1})
    .where({'user_team_nickname_at':'team One'})
    .limit(1)
    res.json({serverResponse:posts})

I need to find a way to iterate between where({'user_team_nickname_at':'dynamicVariable'}) to obtain the first winners of every user_team_nickname_at with the condition specified in Note 1