Well honestly, planes that have less than 100 seats are mainly supplementary aircrafts, meaning they shouldn't be your main workhorse. Try to get a plane that has at least 150 seats, but not more than 250 when you're starting initially. The B757 or A321 is ideal.
But in your case now, just have to be patient, and try to increase your CI. That way you can charge a small increase on your prices, maybe around 5%.