Find a way to make morality respected and even rewarded. Heck, make morality a competitive sport, especially in good deeds. Improve on church role models. They must be straight, honest, charitable, good sports, admirable.
Yes, morality is good and should be encouraged.
But nothing will ever replace conversion. It’s not enough to follow Jesus teachings. One must give one’s life to Christ, and accept the salvation only He can offer.