As others have said, if you can’t find a niche, it will be hard to make any money. They, (niches) are out there, but not easy to find.
Only advice I would give you on rates is to not take work if your fuel cost will be more than one third of the rate offered.
I know it’s a bit of a broad brush, but it’s worked well enough for me for forty plus years.
Best of luck anyway.