If you stay within the Schengen area, 90 days that started on 8 July will end on midnight after 5 October. If you leave the area on the last possible day, you then need to stay outside for 90 days before you can enter again.
The 90 days you can be inside Schengen have to last you for the entire 180-day period from 8 July until 3 January. You can spread them out however you want, as long as there are no more than 90 different dates where you are inside Schengen for any part of that date.
Exiting and re-entering will not change that -- the only* way to get "more days" would be to get a national long-stay visa or residence permit from one of the member countries, which is not likely on short notice.
(After 3 January, counting gets a bit more involved because it's a rolling 180-day period, but that needs not concern you right now).