You beat me to it. The number of professional photographers is miniscule compared to the number of amateurs, and the photographic genres and motivations of amateurs will be completely different, e.g. it's highly unlikely that "weddings" or "portraits" would be at the top of the list.
I'd guess that the most popular subjects with amateurs would be, in descending order:
Selfies
Family
Travel
Landscape
Animals
Sports
Portrait
Food
Wedding
... and how many amateurs photograph "fashion"?
I would suggest for amateur togs....
Selfies - 99% would be via smartphone now. Although I have taken a 16mm selfie with my R5 with articulated screen out - it wasn't great. Crop sensor for reach would be unlikely

Family - Majority by smartphone but prosumers shooting family events for sure
Travel - I see a mix... smartphones for sure but some prosumers. For me, the difference would be a "record shot" vs a creative shot
Landscape - definitely a category for prosumers including seascape, waterfalls and cityscapes
Animals - zoos and wildlife for prosumers
Sports - prosumers for indoor sports and telephoto shots of kids sports would be a larger segment of prosumers as smartphones aren't great in low light/telephoto
Portrait - informal portraits (including fashion?) are mostly by smartphone but certainly some prosumers are doing portrait shoots
Food - instagrammers use smartphones. Professional togs for sure. Is there much food photography by prosumers?
Wedding - prosumers doing freebies but most couples would spring for a professional if they could afford it. Secondary prosumers or specific parts of the wedding eg reception for sure
I'd also add
- Architecture (not real estate)
- Macro (wildlife and other), astro (deep and wide angle plus events like eclipses) for prosumer togs towards to bottom
- Specialty niches of urban decay and trains/ planes/ automobiles