Aleph had remained quiet for the most part during these six months.
He only spoke a few times to guide Eren on his path. After implementing his advice, the battlemage was able to observe its usefulness. He had to say that Aleph knew him and the things he could do like the back of his hand.
Aleph was also the one who told Eren that he shouldn't rush through his breakthrough into the Rank-2. He told Eren to get his basics right so that he could make maximum use of his breakthrough-induced epiphany.
As such, Eren started focusing more on other aspects of being a ranker. He started collecting resources related to various elemental attainments.