[human_person]

I think other commentators made some excellent points about ensuring the receiver is interested in the advice. And you should probably do that.

But in situations where I want to give unsolicited advice I either ask if they’d like some unsolicited advice and respect their response. Or I offer the advice as a story about myself instead of an instruction/order.

For example instead of telling a friend what they are saying is too aggressive I might talk about a time I said something that was a little aggressive and misunderstood and the problems it caused me. So they have the opportunity to learn from my experience without me forcing it on them.