Apply what you're learning to impact your reality :)
-------
Maybe this is a bit abstract but I feel like one of the highest impact things you can do is incorporate the learnings into your day job, experiment, write about the impacts w.r.t your dayjob. I believe that this happens naturally and subconsciously as we learn but I try to make it explicit.
Build your psychology learnings into your interpersonal/team dynamics. Write about the results of what happens when you incorporate them.
Take your history passion and apply it to analyze the historical evolution of your dayjob, or incorporate the learnings of the past to influence your teams success in the future.
I feel like History, anthropology, psychology are ripe with examples, case studies, prior experiences that are directly applicable to day to day human interactions!