I have fished many waters that have not seen much angling pressure, Boilies did not work for me until they had been introduced a but!
What I find did work was bait up with a mixture of big(ish) particles, which included maize, chick peas, maples all bulked out with hemp, wheat and barley, using the big particles as hook baits, I have found that they quickly recognise the bait as a food source, good luck in your endevour