What I offer is a condensation of Matt P, as well as a bit of a supplemental..
Have, develop (if you don't already) a consistent form… The form, itself is best practiced on the bale. What many don't understand is that the bale is not in and of itself a cure all. It MUST be used in conjunction with a second drill called "The Bridge".
The Bridge (in brief) is a drill in which an archer sets a specific number of days/wk he'll shoot and number of arrows. The distance at which the arrows are delivered is close to start and "progress" in terms of increasing yardage in achieved when the total number of arrows have been executed in perfection. (There's more to be said… but I want to be brief.)
The Wall drill is, as Matt P mentioned is also a respectable drill in learning the bounds of one's physical wearwithall as well as shot control; though in and of itself it is NOT a cure for TP.
TP can be discussed ad infinitum!…but IMO, it boils down to trying to squeeze two thoughts into our coconut computer simultaneously…AND ya can't do that! IT MUST be one at a time!
As a final note, the concept of Bale-Bridge, and Wall Drill are all the original thoughts of Len Cardinale. (Archery Hall of Fame, Bowhunter Hall of Fame, original P&Y)
Tom