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Never over 50% power. I'm always shocked by how many people don't know how to use a microwave. I usually worked a long time on my food, I don't want to ruin it through lazy reheating.
Full 900w every time, because that's what the package asks for. Except when it asks for 1000w.
The difference in heating is negligible, but the time saved sure isn't. Always at 100%
That is why I do most reheating on the stove, in the oven or on the contact grill (depends on what it is).
Obviously not always an option to use an oven/stove if you are e.g. bringing a packed lunch into a typical office. It's certainly a better option for some things (you will never get "crispy" from a microwave, period) but microwave still produces acceptable results for many things, particularly if you are willing to put some thought and care into how you use it.
Only time I use the power level selector is for poached eggs. If I'm reheating something where I actually care about how it turns out I'll usually use the oven 😂