I agree with the sentiment that you should simply reduce and focus. With that in mind, I would also encourage you to write down things related to the interests

I agree with the sentiment that you should simply reduce and focus. With that in mind, I would also encourage you to write down things related to the interests that you don't give any focus to — inevitably, they will come up. Random ideas, articles, people talking about it, etc. And I think they needs to be processed to get them out of your system. Personally, I enjoy at least writing down the ideas, passions, or motivations I have towards them somewhere and collecting them. Then, if the time comes when I choose that interest or topic, I already have a good bunch of well-marinated ideas. Of course, that can also overwhelm me, but then you just go to step 1 again!