Can you try mixing the sweet and savoury like purée of broccoli+cauliflower +sweetcorn? Or cauliflower+apple/pear..Maybe that can help introduce other tastes..
Maybe try thickening the pureé a bit by bit to slowly introduce a different texture and then eventually try mashed food and then solids.
Mine much prefers blw to purées (I do both). Could you try some finger foods to peak her interest. Mine loves bread so if she isn’t keen on a purée I dip bread in it and let her suck it off rather than spoon it . She also much prefers sticks of veg than puréed
Stop giving the sweet for a while and focus on veg. Let her have the spoon and feed herself, give some solid food (check solid starts for how to prepare)