Loans / IPO / ETC small business?

We are a small biz. We have about 20 employees. Sales are about $2,500,000 a year.
Looking to expand. We have about $300,000 in loans and another $300,000 in working capital. We have already used up all our credit towards loans. We have bank loans, private investors, etc.
I am looking for another source of funding for some start up projects. I cant seem to find any other investors locally (perhaps i don’t know where to look) and the bank won’t loan anymore. I thought about going the route of IPO but, i don’t know if we are big enough, how costly this is, and if i can even do so since i have so much credit right now.
























