Try getting the rooster to wear a rooster collar.
A rooster collar can be purchased or you can make one yourself.
Some roosters will not mind the collar while others might panic.
If you can get the rooster to wear the collar, his call will be quieter and he will behave as if he crowed as loud as usual.
If your rooster is waking people up at night or too early in the morning, building a soundproof shed or rooster suite to house him in can solve the problem.
Any crowing coming from the rooster suite will be hard to hear so he can crow without causing trouble.