Create your opportunities: promote your film not only by submitting it to film festivals but also by attending to them.
Talk to distributors, agents, be available for interviews, also for local press.
Attend to short film markets, like Clermont-Ferrand’s.
You need to take care of the distribution and, if possible, avoid the DIY. There are many distributors, true professionals. They can help you recover the costs. Your producer has to carry out the marketing function, not you: you need to choose a good one!
Remember that a filmmaker’s job never ends.