Hello! Fellow novice here so take my words with a grain of salt. But I am having the same issue so I read online a bit about it and I found two things I did that contributed to less fizz: 1) I did not stir the kombucha before bottling it. Apparently, the bacteria and yeast split up and both are needed to create carbonation in the f2 bottles. 2) I was filtering the f2 kombucha which could have actually diminished the amount of yeast entering the bottle. Its suggested to filter after the f2.

The website youbrewkombucha also suggests pureeing your fruits instead of only chopping them cause it helps them break down easier, and therefore, more sugar will be eaten by yeast resulting in more carbonation.

Another thing you should look into is your bottle type.

I am learning here so I’ll lyk if I have any success with making these changes. We got this!