top out

[Couch Potatoe]

to reach the highest point; attain maximum intensity, activity

[Cami]

give up ones career just as one becomes very successful

[Laverneenack]

provide with a top or finish the top (of a structure)

[Vania]

In building construction, topping out (sometimes referred to as topping off) is a builders rite traditionally held when the last beam (or its equivalent) is placed atop a structure during its construction. Nowadays, the ceremony is often parlayed into a media event for public relations purposes. It has since come to mean more generally finishing the structure of the building, whether there is a ceremony or not. Also commonly used to determine the amount of wind on the top of the structure.
Another, more functional reason, that a pine tree was hoisted to the top of framed out buildings (topping-out) was that it was a Scandinavian tradition to hoist the tree. When the pine needles fell off, they knew the wood frame below had cured/dried-out so they could in-close the building.[Engineering News, early 1970’s]

[Rihanna]

Top out refers to reaching the highest point, level, or limit of something, often with the implication that progress or growth will not continue beyond this point. This term is used in various contexts such as rock climbing, construction, finance, etc. For instance, when a mountain climber tops out, they have reached the summit. In finance, when a stock tops out, it has reached its highest price point.