Well, I don’t believe I have to follow most of the companies that closely.
Once I’ve made a decision to buy, I have already convinced myself that the company checks all my boxes on a time horizon of a couple years forward (and ideally with many more years of evidence looking backwards).
I’ve thus built my conviction and it helps me stick to the company without having to check on news about them on a daily basis. On average, probably 90% of my time went into researching the company for a buy decision versus following up on it afterwards.
Of course it’s a spectrum, though: from companies on the one end requiring almost no attention at all (well, maybe except for looking at when they might become attractive to buy into) and on the other end perhaps more risky companies that require closer attention (maybe a check-in on a quarterly basis after earnings season or as news about the company surfaces (e.g. they might be about to cut their dividend or already have).
Maybe more concretly with regards to companies in my portfolio:
Johnson & Johnson would be on the “no brainer” end of the spectrum: I buy them when they become attractively valued, no need to (re-)do a deep analyis and read up on their latest 10-K SEC filing.
Amgen, Bristol Myers Squibb, Broadcom and many many others would also fit that bill IMO.
VFC Corp would be an example on the other end of the spectrum. They cut their dividend in Q1 after many of decades (well, 50+ years, actually!) of raising their dividend consistently. The cut seems to have been the right decision for the business and they seem to be back on track (and I still hold them), but I watch their potential recovery closely.
Intel, Medical Properties Trust and a few others fall into this bucket as well.
In practice, I scroll through my portfolio with the FASTgraphs tool (see a brief discussion on this tool in my stock picking thread) on about a monthly basis, eyeball with a really quick glance that my “no brainers” are still “no brainers” and focus on the maybe dozen or so companies that are on my potential exit watch list. For a few of these, I check recent SeekingAlpha articles on them by authors I subscribe to, I read earning call transcripts and check their 10-K /Q on the SEC’s edgar site.
If a company really looks like they’ve lost their mojo, I sell. E.g. I sold Carters after they cut their dividend and their prospect looked vague, I sold EPR Properties after their dividend cut and then unsure outlook (though in hindsight I regret selling) and I sold IBM as I believe they’re on terminal decline (and in hindsight I never should have bought them in the first place).
Of course I keep learning and adapting as we speak, but that’s the overall gist of my current methodology.
It admittedly takes more time than DCA into an index, but I enjoy it and it alllows me to optimize for growing dividends.
And I enjoy doing it. 
Hope this helps?