I tried this recipe as I had some frozen berries taking up room in my freezer, now I always make sure I have some there, so I can make this loaf! Really tasty and always a success, even with non vegan guests!

Oh my goodness. You may have left out a few of the ingredients. Plus I used flaked coconut instead of cornmeal, used whole milk, and canola oil.
The sweetness is perfect, not too much or less. Sorry you had that experience. Mine held together perfectly.

Hello, thank you for your response.
I'll bake this recipe once again since I do see that it is quite popular and the reviews are good.

So pleased you enjoyed it! Raspberries are great in this recipe instead of the blueberries. Fresh work better than frozen because they don't bleed into the batter so much and are drier.

If it is crumbling then it makes me think that something went wrong when you were making it like an ingredient change or not the right amount of something. This is one of my most popular recipes and gets nothing but great feedback and all of my recipes are tested by me and a team of recipe testers so I know they will work reliably in kitchens other than my own.
When made exactly as per the recipe it stays together and slices perfectly and it's not bread-like at all.
You mention it's not sweet enough but there's 3/4 of a cup (150 grams) of sugar in it. That's a standard amount for a cake with 2 cups of flour and it's plenty sweet enough, especially with the very sweet powdered sugar frosting too. Any more and it would be way too sweet.
Did you weigh and measure everything accurately? Ideally with a digital scale? Cups are notoriously inaccurate.
Did you change anything at all? No matter how small. Baking is a science. For it to turn out perfectly everything has to be followed absolutely exactly.
You did use all-purpose flour as per the recipe and not another kind? What brand did you use?
Did you reduce the oil or use something else instead? For instance vegan butter maybe? Oil and vegan butter are not interchangeable at exactly the same amount. You need substantially more vegan butter because it's not 100% fat. That's why it's not listed as an option here.
Is there a chance you overbaked it? All ovens and bakeware are slightly different which is why the time I give is a guide and it's important to use your own judgment and knowledge of your oven.
I hope that can help you pinpoint what might have happened!