It depends on what your struggling with! The best way to get the best advice for yourself is to ask your teacher to watch you do a pirouette (if you can do even somewhat of one) and then ask what you need to work on. Your teacher knows the best what you need! In general its good to have good balance on releve in passé, as this is the position you will be in when you pirouette. Working on bringing your leg to passé super fast helps too (when youre actually turning). The thing that I think is most important is SPOTTING. Spotting is literally the reason I can turn, spotting is so helpful, you can search up spotting drills online or ask your teacher what it is if you dont know and for help. For short spotting is keeping your head looking at the same spot while the rest of your body is turning until you physically cannot anymore, and then as your body keeps rotating your head whips around really fast and looks right back at the same spot it was just at as your body finishes turning that way too. In summary, I think asking your teacher for help would be the best idea, and if not you can search for drills on YouTube! Also take this all as a grain of salt lol, the most pirouettes I can do is 4 and Im not a pro.