This won't help if you aren't really committed, but here it is, for whatever it is worth.
Give it up ... cold turkey ... find something that will make you do it ... and then .. DO IT! It will take about a month.
When I was about 11 or 12 my family lived in Ireland, and I went to boarding school there. During the season of Lent my friends gave up numerous and sundry things, and (not to feel left out) I did too. It seemed to me that to do this properly I had to give up something important, and added sugar (to make Irish school food palatable) was
very important

. I did not add sugar to my corn flakes or porridge, or to the (really quite awful) tea, or to anything during the time of Lent. When Easter came I
poured the sugar on - onto my breakfast cereal, into my tea - and very nearly lost the whole lot onto the floor

; it was disgusting, horrible! I am quite a bit older than 11 now, but I still have a very limited appetite for added sugar - much to my DH's dismay, as he would love it if I would make a few more sweets for him.
Really, it is
very hard, but if you can do it, it really does work. DH doesn't (and won't) believe me, and still craves his sweets - but it does work, if you can truly put the sugar aside for a month or so.
Please note - I said *added sugar*. I was in a situation (boarding school) where I didn't really have free choice of foods, but I didn't skip desserts and such; I just didn't add sugar to things where I normally would have. If you are the cook/food provider you'll need to be even more careful.
As an example: when I make stewed rhubarb for DH and myself, I add sufficient sugar so that I can eat it. Then I make two portions, and put mine aside, adding just about the same amount of sugar again to the second portion to make it palatable for DH. DH has a tremendous sweet tooth, and I have none at all. And before that Lent, so many years ago, I would eat the sugar lumps, meant for the horses, by the handfull.
Good luck: it CAN be done, but it is very hard.