the reddit is pretty good,
r/MicrosoftRewards I check there every tuesday afterrnoon when new MS Rewards quests pop up on xbox for the fastest way to do them via xcloud.
without an xbox its not as good, you can earn around 14k-16k points per month with bing searches vs 25-30k per month with that plus an xbox. 2-3x a year every achievement point you get that month (up to 10k) counts towards rewards too.
Still, for ez mode what you wanna do is use Edge, then create 40 tabs or so of different searches then bookmark them all into one folder. Now every day you can just right click and open all favorites and it'll auto complete all your searches. If you use a user-switching agent you can do both the browser and mobile searches in one shot, or just open all the favorites on your phone too. 15 seconds and 500 points a day. Do that for 4 months and its $60 of credit, enough to buy a new game or a few months of gamepass.