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Take off the carb intake silencer so you can see past the choke to the carb’s throttle valve and, with the motor not running, put it in forward gear and advance the throttle to maximum. Look in and see if the throttle valve is fully horizontal (wide open). If it’s not, examine remote cables and all linkage to the carb to find out what is restricting it, as others have suggested. The problem could be incorrect mesh of the gearing inside the remote control box.
If your boat is big and heavy, you may need a smaller pitch prop to plane it off. You also may need to drop the trim pin to a lower setting. Weight distribution in the boat can cause it not to plane if most of the weight is at the rear.
Dave