I love your interpretation of the wip challenge, that you need to unbury your crochet skills (and not a forgotten project). I am glad you took the bag up and are trying to make progress and as crochet should in my new not only be practical but also fun: just crochet! Who care how fast you are, its not important. Better being slow and having started than doing nothing because of perfectionism.
And also you are using thin yarn and a small needle this is always slower than doing the same with bigger materials. Becoming faster is mainly practice, but as I said, I don’t think everything has to be faster <3