This solutionism is kind of a little a lot problematic. Expecting a single pat answer that utterly projects & reduces all possible wins into a single minded "this is how it will work" confines imagination & potential (just by the pointed ask alone), reduces a complex place we can keep exploring & winning & growing, into an overbearing consumerist expectation that all answers are known, all is worked out, and that there is some total answer thats gonna drop in our laps.
Synthetic feeds of recommendations is an open topic. How much data one is willing to send upstream, as inputs to one's recommender engine, is as much of a topic as how such things would work, what kind of activitypub feeds the engine would emit.
Right now there's nearly nothing & (while I dont agree) a vast amount of the userbase considers this lack to be a feature: a distinguishing characteristic that makes this network human and not aggressively eye-ball stealing machine & greedy. Human connection & old fashioned following people you run into is a win for organic matter & innate connection over pre-programmed ways to insure more eyeball-time.
That philosophy battle aside: there's infinite possibilities here. The way the question is phrased expects there is a singular clear way. You probably should not sign up for a fediverse instance! You dont seem like a fit.