Could be a worn clutch fork/pivot ball. Worn clutch forks are extremely common. I have my own way of measuring clutch forks for wear and measurements from ones at different stages. If it is worn, you can buy a new one from Mitsu for something like $65. Or you can try to ghetto fix it by putting a washer under the pivot ball, or getting a longer slave rod, or by welding a nut onto the part that the clutch adjustment rod threads into for more adjustment.
Actually, have you even tried adjusting the clutch pedal at all yet?
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