What do you think is the best course of action? I have been leery of Windows 10 since it came out back in 2015. Should I upgrade to Windows 10? Should I buy a MAC? I've heard Linux is safe alternative, but I don't know how to code.
Welcome to the forum Pam. I think whether or not you should upgrade will depend entirely on how you use your system. If you simply use your system for gaming or simple web browsing, I do not see an issue with using Windows 7. If you are doing anything on your system that requires security, such as online banking, taxes, or managing any important information on your system, it's best to upgrade from a security standpoint.
It can be daunting to upgrade an OS as you essentially have to relearn everything all over again. Luckily there are apps and tools to help with that, such as Classic Shell, which helps make Windows 10 look like Windows 7.
Linux is definitely a great option, it just requires a much bigger learning curve. Depending on the applications you use, you may run into some compatibility issues and may need to find third party alternatives as their native installer may not work on specific Linux distributions. There are plenty of guides online for each available distribution of Linux as well as many different communities to help support your endeavors should you choose to go that route. I personally think Windows 10 with some customization would feel more familiar to you, but it's never a bad thing to try Linux out for a test drive. It might be a great experience.