Avoid context switching as much as you can. I don't use my phone at all during phone hours (outside of lunch maybe) and try to do work in 90 min chunks where I try to focus on just one thing (so if I'm writing code I'll ignore all slack pings unless it's urgent).

I have also made a bunch of small optimizations like using productivity tools like Cursor so I can avoid copy pasting code into chat gpt. My recent favorite AI tool is https://rockyai.me/ that a previous co-worker built. It's a chrome extension that lets you chat with any webpage using LLMs