Nevermind, power training often affects the player's performance in some of the following matches.
Anyway STrikers tend to underperform in TE.
Wingers seem more reliable.

Try assigning him extra position (AML/R/C). But first, let him play as a winger in one of the next matches (don't care about the orange traingle) and see how he performs.

I consider my strikers as an addition to my wingers