I think that 3 (finding what needs to happen yourself) is the most "get-go" approach. As an engineering manager, the best message I get on Slack are "I noticed

I think that 3 (finding what needs to happen yourself) is the most "get-go" approach. As an engineering manager, the best message I get on Slack are "I noticed our X isn't great, and thought that I can do Y to improve it. I think it'll take me Z time. Can we prioritize this?"