I don't think there is a more beautiful feeling than that (on a business perspective).

So there are several strategies you can do take to grow your business without venture capital.

First you need to understand the problem you have: working capital (cash flow). The fastest you grow the more you need cash. (Uber is the perfect example today)
Before implementing any strategy please understand the concept and its implications: cycle of your sales, payment cycle, inventory cycle, etc with this said, my strategies tips:

Factoring: sell of receivables or invoices at a discount. You can "sell" you rights to collect the money to make your payment cycle shorter and be able to reinvest that moeny faster

In advance payment: just literally charge X days in advance so you can make shorter the production cycle or inventory cycle and ship on time, plus growing faster re investing until the next order

Bank: so this guys have several products for this situations: 30 days loan that it automatically renews, "revolver" loan where if you need more you just take it as a line of credit and its decided in small loans each with a specific merchandising as warranty, if you are shipping out of the country you can use and discount an LC, etc etc

There are others that are more risky but I think you can start by analyzing this three and see how they apply to your specific case

Cheers!