First you need to be a Game Pass Ultimate member but you only need to buy this for one month. If you max out on reward points (including the daily points on the app, the points for Bing searches, the daily, weekly and monthly quests and the points for getting an achievement) plus all the bonus points on the rewards app on the Xbox itself, you will easily get the 12,000 points needed for another month’s game pass ultimate and at least enough for another fiver’s worth to put towards new games or DLCs. You could probably do this with the ordinary Game Pass membership as well but I think some points are only available to Ultimate members.
I’m afraid I don’t know everybody as you appear to do so I thought that, of the many people I don’t know, there might be one or two people who don’t know this.