Step 1: Decrease his minutes
Step 2: Coach him to step up at the line
Step 3: Red light his pinches
Step 4: Pass to half wall rather than shoot
The way he and Bogo (who's playing well) fish at the puck carrier on DZ entries, in almost identical ways, in the identical locations suggests they're being coached to do so.
The idea isn't even awful, they're playing to force a cut to center of the ice where the trailing back checker, of whom Eichel has been noticeably more efficient this year, has an opportunity to strip the puck.
He's been caught several times on shaky pinches or with bad give aways going across the offensive blue line. Put an end to those plays while stabilizing his usage.
As bad, in general he's not getting his shot through, and the forwards are crashing without the possibility of a pass wide, so teams are 100% cheating on his shot. Punish that tendency with adjustments.