If you’re a plumber, you wouldn’t expect people to ask you to fix their car, right?
You’re someone who deals with plumbing, pipes and fixing toilets, not someone who works on cars.
So if people are asking you to fix their car, then you are not making it explicitly clear exactly what business you are in and what your expertise is.
Or, let’s say you are both a plumber AND a mechanic.
Would anyone with a properly working brain think that plumbing and auto repair are the same thing?
Of course not.
They’d expect to be charged and processed separately for each because they are two completely different things.
Just because you might do both things doesn’t make them the same thing.
Get clear about what you are in business to do. Distinguish the one main thing from other, differing things you might offer as well.
Because “anything and everything” isn’t a business category or a profession, much less an expertise.
HINT: Administrative Support is a niche, profession, business category, specialty and expertise all its own. You might also do web design, bookkeeping and any number of other things, but that does not make all those other things the same thing as administrative support.