First of all: good luck.
Seeing how you have a limited budget, I would select the following 3 strategies:
1. Affiliate marketing: offer affiliates a fee for every referral that converts into an actual ‘sale’. This way, you aren’t really paying anything out of pocket, but rather the payment is coming from the sales.
2. Offer a discount/gift/prize to new users if they ‘share’ the fact that they signed up to Vonza, or better yet: for each referral that they do which converts to a sale (so the new users sort of become part of your affiliate program).
3. Utilize the relevant Facebook groups/pages - don’t spam them, offer them something of value and work with the page managers.
You don’t have to have a platform for affiliates. You can use one of the many that already exist, or do things manually at first until you see that it works.
I’ve successfully helped over 300 entrepreneurs, and I’d be happy to try help you further if you. Let me know if you would like to schedule a call. The first few minutes (during which we share information) would be free.
Good luck