Sweet and not carbonated after 10 days fermenting

Hey hey, over the past month I’ve been maintaining my ginger bug, feeding the first two weeks with ginger and sugar (~600ml of water, 1 tablespoon sugar and another of ginger). After the two weeks, I just gave it sugar. It has been bubbling like crazy and definitely smells fermented. No white mould or kahm yeast.

I have made two batches of ginger beer and every time, leaving it 7-10 days ferment, it still tastes sweet and has little carbonation. I only mix the ginger bug and the ginger sugar “tea” once it is at room temperature. I add one lemon per two liters and have added a little bit of cinnamon to one batch. My recipe for the “tea” is 150gr of sugar and 100gr of ginger per liter, boiled for like 10’. It tastes spicy, like ginger. I could probably add a bit more lemon but first want to figure out what I’m doing wrong.

Also, room temperature is 18-23C

(I’ve also made another ginger bug but that one was overgrown with kahm yeast so decided to throw it out and start from scratch€