Same. The €1 upgrade for my Game Pass Ultimate subscription still runs until May 2022. At that point I will just use my reward points to keep it going.
Currently, I've accumulated 341.000 reward points, that's roughly €367, already enough for another 2 years of Game Pass Ultimate.
Earlier this year, I got the €100 Xbox wireless headset by using reward points "for free" as well.
Teach me your ways…..
Best way is to do the daily Bing searches. Kinda depends on your country but I can get 160 points per day by doing searches.
There are ways to automize them like using scripts on Windows or apps on smartphones.
That's already 160*365 = 58,400 points or about 60 USD/EUR a year.
On the rewards page there are a couple of things you can click on each day and get a few points. These vary but usually range from 50 to 90 points. If you keep doing these every day you'll get a streak that will give you bonus points every week or so (75 to 105-ish if I remember correctly). There's only one type of quiz that requires a minute or two and thus is quite annoying. The rest can be done by clicking once.
70 daily points*365 + 90 weekly bonus points *52 =30,230 points or about 30 USD/EUR a year.
Next up are the points you can get on Xbox.
Doing one achievement per day gives you 50 points. 50*365 = 18,250 points or about 20 USD/EUR by just playing games.
There's a weekly challenge with three activities that are extremely easy to complete. Most of them will come natural, you just have to remember to click on them. Those will give you 100 points a week plus a generous bonus 2,500 points for every 10 weeks you keep the streak going.
100 weekly points *52 + 2,500 ten week streak points *10 = 30,200 points or about 30 USD/EUR a year.
Another way to earn a few points in the Xbox Rewards app are related to new releases. You'll usually find an activity that gives you 250 points for getting an achievement in a recently released game. Since a lot of them launch on Game Pass on day one you can pretty easily get those 250 points.
Also for every bigger new release there will be an activity where you get 10% of your money spent right back as reward point.
For every bigger sale there will also be a cash back activity. Something like spent 40 USD/EUR on games from sale x and get back 5,000 points.
Obviously for both of these cases you'd have to spend money but it's a nice extra if you planned on buying these games anyway.
Lastly there are quests exclusively for Game Pass members. I'm not following these too much but they can give you a few hundred points each month.
Looking at the above, 100 USD/EUR a year is very possible with very little effort.
150 USD/EUR and above will take an extra minute or two each day.
And that's only for one account....