Helpfully, if you have raised the prices by even as little as 20%, you can easily use that extra margin to pay for an invoice factoring company who will pay you the invoice upfront - for a fee, but a fee that's usually much less than 20%.

Examples in the UK: https://marketinvoice.com/ http://www.platformblack.com/ or even http://granttree.co.uk itself (though we don't advertise this at the moment - our power-up fund does extend to invoice factoring for startups with no trading history).