Is fabric fusion you used Aleene brand? In my experience glue of that brand bond is weak.
Maybe try E6000 Fabric Fuse, I usually have good results with it. use a small knife scrap off old glue first, then follow the instructions of fabric fuse, it doesn’t feel tacky when freshly applied, take an hour or two for glue start to stick, and 72 hrs to cure. Once you applied glue, clean off excess at the edge, then clam it together with cloth pin something, and leave it alone for 3 days.
from what I see in your photo. I think it will work.
ETA:sorry for the late reply , I am not very active on the forum lately.
Although the bag is white, there is still a hint of colour in it. I had started working with pure white, but thought the result would be too stark. I added a drop of yellow first and saw it needed some grey to give me the correct tint. (I would have used grey had I had some). The drop of black changed the colour dramatically, so I poured in a lot more white. The resulting mixture was the perfect match to the bag.
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