As Someone who has spent decades working with teams around the world with varying levels of English from native to none, these are good guidelines. I would add to try and talk using the simplest and least ambiguous words you can. Breathe. And use shorter sentences.

I also have non English speaking family members so I get to improve everyday. And yes I make mistakes every day but 99% avoidable and the rest I just accept and move on. Multicultural and multilingual teams are a joy not a test so enjoy them when you have the chance. Might surprise yourself how much you will learn about people and communications and build a new level of self awareness in the process.

My 2c.