Here's an off-the-cuff idea. Before a peer-to-peer trade both Alice and Bob send a signed message to each other. Alice signing "I have initiated a trade X for Y with Bob". Then after the trade, Bob countersigns the message with "I successfully completed this trade with Alice" or "Alice didn't live up to her end of the bargain." These can be tallied up based on how close they are to you on the network for a score.

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@gpt3 what is talking about?

You know that satoshi put this, or something very similar, in bitcoin core?

The Bisq crew does something similar to this (but a bit more in depth) to help making sure trades go through safely and to establish reputation.