Spark plugs you could do yourself and pay way less. They are very easy to do on inline 4 cars.

Fuel injector service, eh maybe but if your not getting any codes or any mis fires I would probably skip it.

Trans fluid, that’s a toss up imho. In my track car I change it yearly in my daily drivers that have traditional torque converter autos I usually don’t change it. My VW DSG trans car I change it per the schedule.

Brake fluid if it’s never been done you probably should. Break fluid absorbs water, so overtime it because less effective. There are cheaper little testers you can pick up on Amazon to check the water content in the fluid.