Thanks for the sorting link. Reading is the most effective way to reinforce those kanjis we’ve learned, considering that those 2000 kanjis are the most used ones. (life lesson confirmed here)
One point I want to add is that we can include dictionaries of other languages (if you are not English native) to Kindle. Even your language is not listed in downloadable dictionaries you can still find it somewhere on google (I found my Vietnamese dictionary)