I agree with Aaron. Rotate your grazing, fix fences, and see what kind of grasses you have and get rid of weeds, rosebushes and unwanted junk plants, clean up the pastures. Get a feel for what has better grass,
when. In the process you can retain a few heifers, and keep your eyes open for some cheap thin bred cows, or old cows with calves that won't break the bank. Get them calved out, put weight on them, be able to turn them over for better animals and make a little back from the extra grass. I wouldn't go into any more debt to increase your numbers, but don't throw away a deal on some less than perfect animals that would benefit from feed and a place to turn around. Some times the sorry cows are that way from bad conditions and you might get a few good heifers out of them or they can just help cash flow things. We are buying breds here for 650 to 900. They are a risk, but you can make a bit if they raise a halfway decent calf and then sell them with good condition in the pound pen.
Congratulations on the future purchase. Don't blame you a bit for wanting to buy it.