When you have knitted 70 rows after the underarms on each side, you're ready to knit off the shoulders.
This is identical to what people did on the Fair Isle sweater.
When you finish that, knit the neck. It will go faster because you won't be adding in any color.
Notice that you bound off the armholes when you were knitting them, so you don't have to go back and do anything to them.
If you think they look sort of raw, you could find a knit binding in a store that carries general sewing supplies. Or you could add sleeves. That requires knowing how to increase and decrease, something you didn't have to do on the body of the sweater. I'll let you catch up and decide what you think of the armholes before I teach you that.
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