My business has grown steadily since starting 3 yrs ago w/ revenues climbing every quarter, but we seem to still be squeaking by financially. Advice?

One thing you might consider is sitting down with a CPA or financial advisor for an hour or two. They might have the experience to go over your books and quickly spot issues that are holding you back. If you can't find someone like that willing to help you then consider reaching out to a professor of finance/accounting at a local college for help. You may even become part of a case study for their students!

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

Figure out who your best customers are. The ones that order the most and complain the least. Figure out how they found you, and why they picked you over you competitors.

Then all you need to do is focus on the channels that allow you to reach more of those good customers.

Eg, you might find that your best customers come from YouTube videos you created and the worst customers are local small businesses who never pay on time. Or vice versa.