As a cleaner, to increase my income I'd be looking at the area I live in and trying to work for myself instead of someone else.
Are you undercharging for that area, are there other services you could add such as shopping, ironing, tidying, decluttering help (for those who are just in a mess, not hoarders which is a whole different, difficult area) etc..?
Could you build up your housekeeping skills, perhaps offer to cook, stock a freezer for an older person with meals they can microwave or similar?
If you are willing to tidy, you could advertise that.
Most cleaners say they will not tidy so when I was looking for a cleaner I skipped over the ones who said they definitely wouldn't.
I picked a decluttered on the basis she would take away the things I decluttered so I didn't have to do it.
There are people who are looking for a bit of extra help in their daily lives, try to find the ones that there is a demand for that you can do.
A lot are things that are straightforward for regular people, but may be hard for older people, who are an ever expanding market as the population gets older.
Can you build up your cleaning plus as a business and have others working for you so that you generate some income from those employees?