The problem I see with this idea is that I have no idea who most people are on "my" instance or what sort of content they're interested in. Even for a topic based instance like https://startrek.website/, outside of Star Trek, what are the chances that the interests of the members align?
The Lemmy developers were working on making user defined custom feeds. If that ever get implemented, I'd certainly give many ideas a try. But the Lemmy devs don't have any new feed options on their priority list and I doubt they will anytime soon.
The main dev (only dev?) of piefed seems much more likely to implement new ideas. For example, I had mentioned that only botes from a community's subscribers should be counted on posts to said community by default with the owner of the community given an option to count all votes. It was implemented within days.