Stay on the move
Lots of Stillwater fly fishers have a tendency to stay in the same place for long periods of time, repeatedly thrashing the same piece of water, often without fan casting.
Remember fish can swim and will move about the pond so search for them
You’ll usually stand a better chance of finding the fish if you move every 10-15 minutes or so, once you’ve fan casted a couple of times and searched the depths with the flies of your choice. Of course, if you get some interest, stay longer, or give the spot a short rest and return a little later.