Know What’s Important. The simple version of simplifying is “Identify what’s important, and eliminate the rest".
Limit Tasks. Each morning, list your 1-3 most important tasks. List other tasks you’d like to do. Say no to some of them. See if you can limit your list to 5-7 tasks per day (not counting little things, which you’ll batch). Limiting your tasks helps you focus, and acknowledges you’re not going to get everything done in one day.