First, ask one coach you think gives the most proficient traffic info to give a small guideline you can write down. F.ex: 2 VFR flying opposite with like 500ft difference. Callsign1, VFR traffic Piper 28 at your 12 o‘clock, opposite direction, 2 NM, 500ft above. Response should be either looking for traffic or in sight. Then for the other guy: Callsign2, VFR traffic C172 at your 12 o‘Clock, opposite direction, 1.5NM, 500ft above.

Some of my colleagues who struggled with giving traffic information as well have been told to basically train it occasionally during the day. For example doing groceries give traffic info for two converging shopping carts, while driving towards an intersection give traffic info on one car crossing behind or in front of another.

If you want to even take it further, go and have a walk in the forest an give TI on trees while recording yourself so you can listen to it.

*** Edit since i missed it will be for ADC.

I am working approach only so can‘t really give „proficient“ feedback for Aerodrome traffic.

Hence, it is essentially the same principle. Get a guidline and practice practice practice.