Settings > General > Transfer or Reset iPad > Reset > Reset Keyboard Dictionary
The green-circled reset you meet first, then tap the red-circled Reset Keyboard Dictionary button in the popup:

The keyboard dictionary can lose the plan as typos accumulate and with whatever other gremlins get incorporated, and a keyboard dictionary reset once or even several times a year can be helpful.
Correcting the typos has (at least lately) can steer away from and reduce the proffered mistakes, but that can take a while.
Resetting the keyboard dictionary removes all the local (mis)spelling adaptions, whether correct or otherwise.
Yeah, the wording of those reset controls always makes me extra cautious around which buttons I press when in the reset section, too. The wording just makes me think about my own iPad backups each time I’m in that section of Settings.
And I don’t run with autocorrupt enabled. Settings > General > Keyboard > Auto-corrupt, err, Auto-correct > Off