The question you need to be asking is: How do I change the business itself so that it gets more efficient?

The act of running your business has to make your funnel better - and this is what you need to figure out.

Without knowing the intricacies of your business it's hard to guess - but you need to evaluate the distribution of your customer base, because it could be that there is no clear path between the early adopters and the early majority across each of your value propositions - and this is why you're not growing. Happy to chat further