How to get better at context switching?

The main thing for me is to write a lot. Everything you do, you should be oozing communication:

• Write well-detailed tasks
• Write high-quality PRs
• Take thorough meeting notes
• Regularly update people on what you're doing across all your tasks/workstreams (emails, Slack/Teams, etc)

This way whenever you go into something (e.g. "I have my 1 on 1 with Mark tomorrow, and I need to figure out what to talk about"), there's a bunch of rich context you can quickly "download" to get right back into things. I talk more about building a stellar writing muscle here: "Tips for someone with poor working memory?"

Here's another useful related thread: "How to work on multiple tasks in parallel efficiently?"