2. Use something like clockwise to compress meeting times
3. Block your time so people literally can't schedule you
4. Ask for an agenda
5. Actively challenge status update meetings which serve no one. Use tools where you can pull the data. Or ask to have the data pushed to you (email). If this can't be done, work to fix that problem instead.
My biggest piece of advice? Say no to 30 minute meetings. Ask for longer meetings. This is counter intuitive I think, but I feel like 30 meetings give people enough time to get started talking about something and then no ability to finish the discussion. They become filled with "let's circle back" or "let's not get into the weeds" type chatter. No, let's get into the damn weeds and as a result on the same page. For certain things, I demand 2 hour meetings so we can actually hash stuff out.