Skribble has a really really good idea.
A good % of people who engage plumbers are women, and the impression I get is that they don't feel that comnfortable with the way plumbers interact with them. (To put it mildly).
My family are builders, and there's a shortage of good plumbers.
With all due respect, the issue may be your expertise, rather than strength. Not trying to be negative, but if you're going to try and live off this, make sure you are good at this stuff.
Obviously I can't even guess at what you've done with your life, so feel free to ignore this irritating idea.
As for physical strength, the issue is fingers not arms. You can hire arms. Some plumbing involves removing old baths, and no one is strong enough to carry that much cast iron safely down stairs.
A big thing about being a successful tradesperson is having contacts with reliable arms. Also electricians, carpenters etc. Maybe you subcontract, maybe you pass work around. Lots of jobs require extra specialims, for instance can you tile a wall after you've put in a new bath ?
But you need strong fingers. Part of your work is putting your hands into awkward places at strange angles. The connections to taps seem almost maliciously designed to make your life hard.
Also you may have to do it wearing leather gloves.
You can't subcontract this part of the work, as it is the skilled bit.