For day to day use I generally grab anything that I am interested in and leave it seeding indefinitely, or until I need to prune to free up some space.
If I need to boost ratio I grab something that is new and hot to seed for a bit. In general though, I try to seed things that have lower seeder counts so that they remain available. Many times these are not things that I am really interested in.
If you are not using any private trackers then I suggest you get on one and just be active. If there is a particular thing you are interested in then there is probably a tracker for it.
I also seed Linux ISOs but those are public so it doesn't help when it comes to ratio or anything. It's just a thing that I do because I can.
Alberta here. I had no problem walking in to the local pharmacy and getting my COVID booster and flu shot.
Of course, my province probably has the lowest vaccination rate in the country so there is that.