I agree it's a super grind, I launched one by myself. You need to quickly target your audience and position them as quickly as possible. Think of it as product development: you need to invest a lot of revenue until it matures (in this case the MVP). Until you get the rewards, you will need to invest in improvements, mobile optimization for example.
check it out https://famaxseguros.com.br
this is my 1 month online MVP and and I'm getting leads via PPC, heading up to rank some keywords.