I think the Vocabulary Strategies of Tune In to Interesting Words, Use Word Parts . . ., and Using Dictionaries (etc) are strategies that would still be important for these readers. I feel like I still grow with these, even as a proficient reader! 
I would also think that many of comprehension strategies used with a variety of genres could be valuable for them to grow as readers. Gaining insights into author's purposes for writing, questioning while reading, inferring and supporting with text evidences are a few that jump out at me that readers use throughout their reading lives.