Will add it to my todo list, also what do you mean by Canva gets free traffic because it creates kinds of slides and I could do the same. Do you mean like add boilerplate invoices or smth? cheers

Try searching google for

    Birthday card template
    Event rsvp template
    Restaurant menu template

You should have examples of every possible invoice so that over time (1 year+) you start showing up for niche invoices