You could exercise horses because it is good experience to ride different horses and it is good money
Sell extra close you don't wear or fit
Buy good shape but used reins, halters, saddle pads and belts. Bling them out with sparkle or bedazzle them and sell them at shows and barns. I use sparkle and sew them into braided reins with clear thread (3 a side) and sell them - it's easy.