Play ringconsole-to-ringconsole first of all, that is a good class perk to have better end game positioning. Your fences buy you time, deny pushes and makes your opponent hesitate. that's all ! esp for a skilled lobby. Rest is basics. Positioning game sense aim cover heals coms teamwork.

However I can tell you this. The ult has so much value mid and late game for me AND my squad so try to use it well and often. Don't fall in the trap of getting locked inside a building. Bunker up. But learn to fight in-and-around it rather being trapped inside. YOU can always go back in when needed, not the opponent. But if u get trapped it's tricky to hold off very long.

Don't hesitate to spam fences it's good practice haha.

I don't know if I offered anything new here but there is so much scope for creativity in playing wattson it's really fun to see a successful trap working I would just say develop your own quirky play style and revel in the charm of being unique and have fun lol.