There's a thin line between dedication and mania.

I'd probably manually classify domains by topic.

The top 100 domains appear at least 138 times each.

Domains appearing >= 100 times are 149.

The top 500 domains appear >= 35x each. (Number 500 is a personal fave, lowtechmagazine.com).

The top 1,000 sites, >= 17x each.

14,676 sites appear more than once.

37,966 sites appear only once.

25% of FP stories come from 31 sites appearing 400+ times each.

50% of FP stories come from 331 sites appearing 51+ times each.

75%: 2,521 sites, 7+ times.

90%: 7,749 sites, 3+ times.

95%: 11,173 sites, 2+ times.

99%: 13,992 sites, 2+ times.

Pick the degree of completeness you want (your 5% "misc" would require classifying slightly more than 11,000 sites).

I'd probably aim for 50--75% coverage.

OK, while writing this, I've classified about 10,200 (of 52,642) domains. (most of the first 300 manually, a bunch of the rest based on regexes, e.g., .edu, .gov, blogspot, medium.com, substack.com domains, etc.).

By site:

1 7621 software
2 1710 blog
3 535 academic / science
4 123 government
5 41 general news
6 34 ???
7 31 corporate comm.
8 30 tech news
9 15 general interest
10 10 business news
11 8 law
12 6 technology
13 4 social media
14 3 corporate comm
15 3 general magazine
16 2 general information
17 2 science news
18 2 tech discussion
19 2 video
20 1 business education
21 1 corporate comm.
22 1 corporate commm.
23 1 general discussion
24 1 health news
25 1 images
26 1 law
27 1 legal news
28 1 misc
29 1 n/a
30 1 podcast
31 1 tech blog
32 1 tech law
33 1 tech publications
34 1 technology / security
35 1 translation
36 1 videos
37 1 webcomic

Unclassified: 42442

By story count ...

1 13782 general news
2 13398 software
3 10473 tech news
4 8677 blog
5 7651 academic / science
6 7294 n/a
7 4750 ???
8 4600 business news
9 3546 corporate comm.
10 1504 general magazine
11 1291 general information
12 1162 general interest
13 1132 technology
14 1099 videos
15 1073 social media
16 975 government
17 568 corporate comm
18 559 tech discussion
19 505 tech law
20 251 tech publications
21 171 tech blog
22 170 science news
23 136 business education
24 104 corporate comm.
25 103 video
26 99 corporate commm.
27 96 general discussion
28 80 misc
29 71 technology / security
30 61 law
31 59 webcomic
32 49 translation
33 48 health news
34 47 images
35 46 podcast
36 32 law
37 7 legal news

Unclassified: 93213

'???' indicates I couldn't (quickly) assess a domain. Examples: 37signals.com, readwriteweb.com, thenextweb.com, archive.org, anandtech.com, avc.com, docs.google.com, righto.com, slideshare.net, infoq.com, hackaday.com, gamasutra.com, marco.org, smashingmagazine.com, highscalability.com, catonmat.net, centernetworks.com, jvns.ca, scribd.com, about.gitlab.com, cloud.google.com, alleyinsider.com, msn.com, firstround.com, axios.com, openculture.com, onstartups.com, ejohn.org, dadgum.com, shkspr.mobi, mixergy.com, geek.com, gmane.org, foundread.com.

Note that I'm classifying by site rather than story, so an NY Times item on, say, quantum computing, would fall under "general news".

Also, very quick ad hoc code here, there are assuredly errors (and I've already fixed a few in stealth edits to this comment).