Also, out of those (low sugar, intermittent fasting, keto, or vegan), recommend doing what works for you and your lifestyle. Any of them work as long as you are in a calorie deficit. Figure out your maintenance and cut calories based on how fast you want to lose.
Generally low sugar is going to benefit you from an all around health perspective no matter which dieting approach you choose.
Check out the loseit Reddit page/wiki page for more info on dieting in general -
https://www.reddit.com/r/loseit/s/WbzPaI7ily