After leaning at least 600 kanjis you start to feel "diminishing returns" in making lists and repeating isolated words.
I can only recommend you to read and write texts with a certain frequence, so that you can learn new words and their kanji. After sometime you will start recognizing patterns and readings, for example: the "張" in "見張り" and "頑張る".
In my opinion the best way to "absorb" knowledge is by using it, many times, in different ways, hence, the writing part.