I don't know, this may be more of a suggestion (I don't know where to post those), but I think that bells once rung unless like placed on a wool block alert nearby hostile mobs and make them walk toward the location of the sound.
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That's not what the bell is intended for, so this is actually a suggestion. The bell is intended for alerting villagers of danger, detecting specific mobs (witches and illagers) 32 blocks away from the bell, and getting villagers to meet in a specific area between 9000 and 12000 daytime.