- From what I gather you are 3 guys (who cook ethnic food) who get hired through a catering agency.
- For Zeus knows why, your biggest client (the catering agency) dropped you.
- You mention not marketing properly and now seem to not have a good customer list to cater to (pun intended).
In your situation the best option would be:
Print out some flyers and cook some samples. Go door to door to every fucking office park in a 5 mile radius and take some sales. Do this before lunch! Now, about those samples. You have to prepare plenty of samples. Put out your best stuff. The way you display them is very, very important. Make sure that everything looks and is clean and tidy. Wear some nice clothes that don't smell like you came out of a kitchen. Smile.
Do this for 3 times a week for 3 months, then once a week forever. You will not have to worry about this happening again.
Remember: Every person that tries and likes your food is a customer. Take an order right there. Close the sale while they are enjoying the sample. Don't hesitate.
Also, raise your prices by one dollar in the entire menu, and give a $1 discount to those who order right there. People can't turn down tasty discounted food.
Disclaimer: My sister in law has a business like yours and I grew it to a very nice size with that same tactic.