Hey there VikkiB,
Thanks for reaching out to the Apple Support Communities.
Based on the steps that you've already tried, if having issues with the letter "i" not capitalizing automatically, we'd like to have you try resetting your keyboard dictionary with the steps shown here: Return iPhone settings to their defaults - Apple Support
1. Go to Settings
> General > Transfer or Reset iPhone > Reset.
2. Choose an option:
- Reset Keyboard Dictionary: You add words to the keyboard dictionary by rejecting words iPhone suggests as you type. Resetting the keyboard dictionary erases only the words you’ve added.
Keep us updated on the results after going through the steps above.
Take care!