I generally go to a website and if I like the content, I look for an RSS icon. If I can't find one, I'll browse to either [domain]/rss, [domain]/rss.xml, [domain]/feed or [domain]/feed.xml, because most websites that support RSS will have an XML file at that location. This has worked for every site I've tried it on so far, except for Genius' website.

This is how I manage it:

• Usually I add feeds of blogs I find out from other aggregators (people posting links, HackerNews, Lobsters, Kotke.org, etc).
• This website categorizes blogs, I found some really good gems there, so I follow their feed.
• My RSS reader of choice (Inoreader) can show trending topics from feeds I am not following.

Check out some of these directories:

• https://blogroll.org/
• https://indieseek.xyz/
• https://personalsit.es/
• https://blogsurf.io/