Automate clean up of contacts to avoid going over limit

All

We have a contract with eloqua for our instance to have X number of contacts and we have issues staying in that limit for some time. For now, we have put in a place to proactively look at the contact volume and periodically deleting them, which is not efficient by any means. So wondering, if there is anyway to automate this. There are couple of things i'm looking for

1. proactively monitor contact volume ? Any time we go over limit is there anyway to get notified?

2. We want to have something that runs on a scheduled basis, looks at the number of contacts in the database and if we are over limit, delete. (How to identify which contacts to delete is something we will have to figure out). But at high level, is something like this possible?