Getting back on track

Hey gang, looking some advice. Im a coder who does both hands on keyboard work as well as a lot of coaching / training / strategic thinking and architecture.

Of late iv felt out of sync with it all, i dont fee like im anything close to top of my game, and run out of road for any real challenges in work for myself.

Had went to a few interviews to seek out new opportunity / challenges but ashamed with my technical assessments and just general performance now too.

Anyone else gone through similar? How do people get themselves back on track