Underpaid?

Been working for an educational tech company (central Pa) for a few months and the salary was supposed to be negotiated at 3 months. I haven’t set up the meeting yet because I want to know how much to ask for. So I’m a videographer and work within the marketing dept mostly. They had an expectation of creating 2 videos per week and to have to hire a video consulting company for my on boarding. So in my first week, I made 10 videos and expressed that the consulting company might not be needed. They said they had already paid them but after a few conversations with the consulting company, we switched our strategy to a higher level plan. After about 3 months I’ve created over 40 videos for the company and have put into place a vast amount of video marketing strategies and systems. I’ve generated about 10k views on our videos in organic traffic (not a single ad) and put into place to YouTube channels that have strategies, schedules, and incredible potential. I’m getting paid 38k annually right now. I’m also only 23, but I do have over 5 years of experience because I worked full time in my field even during college. I want to ask for atleast 45k. Thoughts? I love the company but I have a mortgage and a life I want to finance and save for. Would I get paid more for my work somewhere else? Thanks!