All of those niche fields already have tech, often an incumbent company that started with MS Access and is struggling to scale.
Two niches I encountered, independent music schools, garden centres/nurseries.
So you're not going to bring a flourish just by bringing tech, they already have it. But can it be done better? Hell yes.
Can you make a business model out of doing it better?
...I don't know. In my country, that's a lot of start-ups that target agriculture, and deliver some good results, but then find out that farmers are risk adverse when it comes to new spending.
An old colleague developed fantastic software for managing hives, and then found that the beta testing apiarists who loved his software were even more risk adverse than farmers.
But yeah, if you want to target a niche, you need a partner who not only knows the problem domain, but the market/social network, and has good relationships, as sales will initially be word of mouth.
