You sound like me, three and a half years ago. I was tired of being broke. Thought I would do pet sitting, but that didnt earn me enough. I began cleaning houses, and of course at first I made mistakes. I learned from them.
I get most of my business of two websites that operate nationally, I believe. Care.com and Thumbtack, both are quite good. Thumbtack is not free - you do pay a fee, and it is quite confusing. Care.com has other weird rules. But they DO find me work, and now I stay busy 5 days a week. It takes some time to build up a good reputation in cleaning or whatever you decide to do.
I no longer pet sit, except for cats. I love cats, and always will. I no longer take dog sitting jobs, because I prefer being honest with customers. I just am not a dog person.
I would like to hear how you are doing, since I can relate to your situation.