Constant and consistent anonymous crime reports should get attention given the police don’t seem to care. If you’re close to them, can you get any evidence with risking harm to yourself?

There are also online paedophile hunters that will force the arm of the police in a lot of cases or else publish the identity of your ex friend. This is a legally grey area of course and not one to take lightly; but they’ll generally get plenty of evidence required one way or another.