Bottom Line Up Front - opening your message with the core request or message first - is a related practice from the military that works really well for email. https://en.wikipedia.org/wiki/BLUF_(communication)

The way I apply this to emails is to ask myself: if someone only reads the first sentence would they know what I need and if they need to act on it immediately, read it at their leisure, or file it away?

I like this one, it's a little more subtle: https://yeshello.org/

People, particularly family, calling me on the phone and then asking me what I'm doing as if it's any of their business and it's their decision whether what they need is more important than what I'm doing is such a pet peeve of mine.

I admit to being guilty of the "YT?" or "Hi" type messages, but it's for a reason: the person may be presenting to a client and shared their screen instead of their window.

I've been on too many Zooms where the presenter's Slack pops up saying, "John, we have a call with <company name> about <topic> at 3:00. Can you join?"

Multiple times, this information was probably sensitive. I'd rather avoid that by waiting until I get a response.

At one point I installed a filter on my IM client to silently discard trivial messages like "thanks" and "OK". There were already delivery indicators so nothing was lost.

Perhaps a hello filter and "yes?" auto responder could help, at least during business hours. Then send an OOO message if after hours.