Jeremy’s flash cards

So I’m currently watching Jeremy’s videos for the CCNA. I upload the flashcards of the day after watching a video. I don’t delete any. I do about a video or 2 a day but I notice after hitting day 22 it’s starting to be overwhelming with how many cards I have accumulated. How do you go about managing this? Do you delete a subject after a few days? I would really like to hear opinions on this.