It's totally understandable that you've had enough of book 3 - the selection of pieces is pretty dire, from what I've seen. I listened to every piece listed on the contents page and found that I only liked 11 of them, which is why I decided not to buy book 3. I just wasn't prepared to endure playing around 40 pieces I didn't like, for the enjoyment of 11 pieces that I could find elsewhere. It's a shame because Alfred's course books seem well laid out and I'm sure that each piece is chosen to help learn new skills, but book 2 has pushed my patience with playing awful pieces to the limit.
Sophia, I think you'd benefit from playing music that you love, it will motivate you. Maybe you could buy a book of boogie woogie/blues pieces, then work through that in a methodical way - perhaps starting a new piece each week, while working on one or two pieces that are already works in progress. In short, you can plot your own path now. You have trawled though the first two books and around 2/3 of book 3, so you have a good grounding in piano skills (not to mention those MUSICAL GENES - in case you forgot about them!) - I'm sure you can develop your skills without forcing yourself to play Drunken Sailor or the other abominations of music that Alfred offers! So, congratulate yourself on coming this far and move on with confidence!