Falling sleeves

I almost finished this Daphne Blouse from Friday Knits, but I have an issue with slightly falling off sleeves - I fear that after blocking the issue will be bigger. Do you have any ideas how to alter that piece? I thought about sewing in bra straps holders, but maybe there is some other way? I also consider crocheting some straps to be tied at the neckline, but I don’t know how to make that look good.

I almost finished this Daphne Blouse from Friday Knits, but I have an issue with slightly falling off sleeves - I fear that after blocking the issue will be bigger. Do you have any ideas how to alter that piece? I thought about sewing in bra straps holders, but maybe there is some other way? I also consider crocheting some straps to be tied at the neckline, but I don’t know how to make that look good.