I'm using Persian language in swiftkeyboard for long time and i have some suggestions
If it possible to remove some useless keys you can open space for other keys and have bigger and easier to use keys
Really useless keys are:
"؛" " َ " " ، "
By removing these you can add these :
" ض" "پ" "ژ"
I hope it was useful and sorry for my bad English 😁