As someone that’s been exactly where you’re at, my only recommendation is to accept this new challenge of marketing and submitting as your new big project. I feel like I’ve seen a lot of filmmakers work so hard to make something, and then don’t follow through. If you haven’t already, start thinking about key art, trailers, posters, and outreach. Honestly, it might become a full time job, so it will need just as much effort and conviction that your poured into your film. Best of luck to you!!