Is there anyway to reset my keyboard back to its original settings, so that the responses no longer show up like on the old keyboard?

I’m using the factory installed keyboard and I’ve been on many screen sharing appointments with Apple and they have tried everything they could think of but with no luck. The did however figure out why I can’t type fast so what they did is have me turn my screen sideways and had me try typing fast that way and it worked so know we know there is something wrong with my screen and it has nothing to do with my screen protector because he had me take it of. I just wanted you to know that in case you answer someone else’s questions they might have about the speed of typing anyway the only problem I’m having now is the auto fill part because it will show me options that no one in there right mind would use like when I type in email address it shows me on option and it a email address that I don’t even recognize so I’d like to now how to reset that option and if you could help me out I consider you a rock star… 😊

Yes I have an iPhone 14 Plus I’m sorry I failed to mention that 🤦‍♀️