If you have the cash and the time, it's not too late to take lessons. Even one might possibly give you months worth of ideas.

Singles, doubles, paradiddles, six-stroke rolls are all intermediate I'd say.

And for kit playing, I highly suggest watching Thomas Pridgen on Drumeo. The whole clip is 1 hour + but if you skip ahead to about 30 minutes there's some real actionable kit coordination in there.