For one thing, someone here who is learning about you for the first time doesn't usually have the time to listen to 5 of your videos on the same day. Especially when they have other posts to check in their feed too and lots of things to read on Steemit. They will be overwhelmed with so much information at once.

I would say that 2 posts a day would be good for you, but it's your decision. Start slowly though, and then maybe down the road try 3 in one day to see the response.

Also, take time to interact with the community. Go and comment on other posts if you have something worthwhile to say. Find common ground with people. Don't ask them to follow you, but they may do just that if they see you involved on their own posts.
If you become involved in the community, they will reciprocate, but it takes time.