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One simple piece of advice is to take down the key stats of each player when they level up and make it clear no character can have 5 higher in AC, to hit, max save, Spell DC etc than the next best player. That prevents combats that unfairly challenge everyone else but one character is able to cakewalk.
Set this expectation out right from the start, so that he can focus on optimising choices rather than sheer power. You may need to tinker with this if he is playing a fighter in a party of sorcerers or if he has several abilities that allow him to boost these core stats (arcane accuracy for instance).
It's a simple solution that doesn't penalise him retrospectively.
I have to point this out. If you take any advice DO NOT take this one. It is one of the worse things you can do as it basically sets the limit at the worse possible player and makes them have control over others while penalizing anyone who uses a modicrum of intelligence differently. A Fighter should not be within bounds of a Magus nor should a Monk to say a Evocation focused wizard.
A Paladin Will have outstandingly better saves than a Rogue, the examples go on. DONT DO THIS.