Work stuff, Getting it, take that imposter syndrome
This is not something super amazing or anything but I just wrote a cloudformation template from scratch for a full stack deployment with all the monitoring in place to directly integrate with Pagerduty and Slack in about two hours.. And it went off without a hitch.
I feel actually competent at this whole SRE thing beyond advising engineering on best practices and how to implement them. (Which aside from running deploys for some other teams has been my primary role while my other team members handled this sort of work)