Some language learners are obsessed with the amount of words that they can possibly “memorize” every day. Equipped with memory techniques and spaced-repetition flashcard apps they aim to learn dozens of new words per day. In reality, however, learning a language is not just a matter of mindless memorization.
Realistically, you should not set a goal of learning more than a few new words a day. Moreover, you should only learn new words that you plan to actively use in conversation. Otherwise, your efforts to learn new words will go to waste because the brain has a natural tendency to forget things we don’t really use.