There's a germ of a really interesting idea in here, esp with video sort of becoming the de facto standard of content consumption these days ( at least in short form across social media ).
Maybe take a breather from the tech side and go out to some possible users, and I would almost start super niche-y with this type of thing. Don't bother developing some type of customizing generated video tool yet. I bet there's a substantial group of people out there that either have historical content that they would pay to put in video form to distribute across social, or some group that's forced to produce content in standard text format, but would love an easy 'to-video' button solution. And in both cases, I would imagine they would have very specific requirements for you in terms of transforming their content, how the output should look, etc, etc, etc. It would probably be all kinds of specific code that you would be loathe to write for a single client, but you should. And from that maybe it will help guide you w/ whatever next tech thing is worth implementing. Anyhow, 2 cents from internet stranger so take it for what it's worth ;)
I am curious though, what is the bulk of your costs in hosting that's pushing it to 2K in 3 months -- or am I mid-reading that?