Did Garraka even have enough screen time to affect the budget?
It wasn’t just Garraka as a character - the entire NYC freezing over sequence is what likely cost a lot.
In that alone you have the weather radically changing, the ground becoming ice, ice poking out from the ground while many extras flee for their lives, ghosts breaking out of containment, etc.
The other major expensive sequence - the opening car chase through NYC. There you have many extras, a lot of damage being caused to breakable objects they had to secure, cgi effects to make the ghost and trap look real, etc.
While these are quick sequences, there was a lot of work that had to go into them on both a computer and practical effects level that couldn’t have been cheap.
There was also the library lion, but I can’t imagine that costing a lot since it’s less than a minute I think.
The cast also expanded, but I don’t think Patton nor Kumail could have made that much of a difference on the budget especially Patton considering it was more a cameo. Actors also may have asked for more, but unsure on that front.
Thus, if I was to guess - it was the NYC freezes over and opening car chase that really boosted the budget as both sequences looked really expensive.