Clash of Clans is built around timers, upgrades, resources, attacks, and clan obligations. That can turn one game into a background routine across the whole day.
Set planned windows for upgrades, attacks, and clan activity. Put Clash of Clans inside Apple Screen Time and use Sandflow to time each open.
Turn off nonessential alerts. Keep only the clan or war notifications you actually need. When the timer reaches your limit, leave the next upgrade for the next window.