Need help setting up Scheduled Reminders
That depends on how you record your renewals.  The "correct" way to renew a membership doesn't create a second membership, but changes the end date on your original membership.  However, that's not workable for many organizations for a variety of reasons.

However, if you do renewals the "correct" way, then you could set your August 1st scheduled reminder to go out 1 month before the membership end date.  See screenshot.  October 1st can be one month after membership end date, and so on.