Digital transformation consultancy, pandemic planning, software (anything that promotes remote working etc) task management/planning software, I think e-commerce will be huge post this
During COVID-19, there are a few business verticles that are growing quickly.
Manufacturing and importing goods that are in high demand are one example.
A friend of mine owns WOODCHUCK, USA which as of 2 weeks ago manufactured wooden products using their laser machining equipment. Since then, they've pivoted into manufacturing face shields and face masks using that same laser equipment. They were able to keep all their employees hired and are even hiring more.
Another industry that will see a lot of post COVID-19 demand will be debt collections and businesses in that nature. There are a lot of people/businesses that are going to have outstanding debts from this period, and individuals in addition to businesses can venture into debt collection via starting an agency to take a cut.
Digital services, IT services, and other remote working consulting will also increase in demand. As companies transition from office to remote work, they will need experts to help them implement these new transitions and adapt to delivering products/services remotely.
Hope these examples help :) Good luck!