I can relate. Lately, I’ve become more strict that I am not to be disturbed from 9am to 5pm, because I need to work. I want a life after I’m done for the day, so having this rule has been super helpful and people seem to take me more seriously.
It also helps posting pictures of yourself working, whether it’s designing something or writing an article for a newsletter, people like to see that and will tend to trust you more.
Anyway, just my 2 cents :)