Fins make a HUGE difference. If you are still riding the white plastic fins I want you to throw them out right now. Take a look at the Futures - John John (grom size) fins. If you love the board so much now with the fins you are using these will make your head explode.
https://futuresfins.com/fins/grom-john-honeycomb.html
Generally speaking look for a fin with a base 4.25ish, depth (height) of 4.5 or less, area of 14 in^2 or less, and a sweet of 34 or less deg. Look for a fin with a flat inside foil or a blended foil. You can put a fin with a lot of flex in a wakesurf board because it's not like you are ripping massive turns in critical parts of a huge wave you can use the flex for more speed or add some liveliness to your turns.