There are a lot of different types of bike so it's hard to advise you.
What's wrong with your old Scott that it can't be repaired? There's a ton of information on the Internet about how to do your own repairs, if you're mechanically inclined.
Here, in Florida, there are dozens of pawn shops with racks of used bikes. It's just a matter of picking one that suits your style, check it out to make sure it's rideable, and go with it.
I ride a fat bike with road tires, and I ride a hybrid. Two bikes because I like the change in the feel of them. My riding style is casual, too, but I ride every day, 8 miles every day and occasionally up to 20 + miles, but have ridden 35 miles. That's a bit hard at my age - 73.