Meera, the two replies above are the most common causes and they usually appear together.
A diagnostic worth doing this week: take your last thirty orders. For each one write the price, your true cost including wastage, and the honest hours from enquiry to handover. Then calculate profit per HOUR, not per order. Almost everyone who does this the first time discovers their most popular product is their worst one, and that a small number of high-touch customers consume a disproportionate share of the week.
The fixes follow directly - retire or reprice the loss-making line, standardise designs with priced customisation like Vikram did, minimum order values on things that only make sense at volume.
One more thing worth naming because it's doing real damage: you said you're turning down work while being broke. That's a strong signal your capacity is going to the wrong orders, not that you need more of them. More volume won't fix this. It'll accelerate the burnout.
This is squarely what the business module of our programme exists for, but you don't need a course to run the thirty-order analysis. Do that first.