I felt just like you one year ago. Honestly, I think that you must stick with grade 3. Commit to 8 practice slots for each modules and 3 transcribing slots. Split it over multiple days. Move to the next module after that even if everything is not perfect.
Grade 3 will unlock all the intermediate grades. You will grow as a player.
Find a song project to keep things interesting. For me, it was learning all the songs in the rock songbook. It made me improve a lot, I would recommend it to anyone as they are achievable at your level, but still challenging. Math07 JG Rock Songbook Project (10 out of 15) - 3 songs added 3 June