I’d say it was very difficult to run a new event from scratch by yourself - if its a rolling programme where you have the process and systems down to a well oiled machine then it’s a lot easier.
Your key I would say is plan plan plan. Make sure you’ve made a project plan of every tiny task that needs to be completed, along with deadlines - checking what tasks have to be finished before the next can start.
You could see if anyone is interested in volunteer work to support some of the administration side of things or someone that is looking for more experience in events management - maybe someone studying at the moment. See what local colleges are running those type of courses?
See what free software is out there to make the absolute best of the small amount of time you have - mailchimp, eventbrite etc
If you have budget outsource - I know you said it hasn’t worked well before so make sure you delegate properly and monitor closely.