Information related premium projection methods

I'm currently working on a publication on the market analysis of digital insurance services in Country X (let's not name the country) to assess whether the Country X is ready for digital insurance services.

Also, I need to include description of methods of premium projections to assess future revenue of insurance industry if it adopts digital insurance outlook.

I'm pretty much done with market analysis part based on desk research and data received firsthand via primary research.

However, for the premium projection bit, I'm quite puzzled on how to tackle that as I don't know the names of these methods.

Can anyone guide me on how to tackle this preferably by naming key 5-6 methods for premium projections along with supporting documents (research papers)?