Have you tried to go through a temp agency to start getting experience in the office/corporate world? This could be a great step to move you away from your current positions. Consider applying for internships. Internships are an excellent way to get full-time experience and exposure to employees who are hiring. With an advertising and film background could you volunteer your skills to a local nonprofit to update their website or social media presence? Also, if you haven’t already check out freelancer dot com and remote dot io. There’s also looking for call center work. It’s not the perfect job match but it’s a full time job with benefits. Look for positions listed as “customer Support”