You have a writing schedule; why not make one for getting in touch with your audience?
Answer comments, reply to PM-s, say Thank you for the follow! on social media. If you receive too many comments and don’t have time to reply to all, make sure to at least reply to one by each person; if you have too many followers and you can’t make time to thank each individually, send a bulk message to your fanbase. For example, every Sunday you could write a thank you note on Wattpad and click Notify my Followers before you hit that Post button.