The question to those who have long been in the crypto topic. PC protection is an important part of monitoring different ISO and others, even if all the keys are stored on a USB flash drive.
How to secure yourself more than usual? Maybe there are some special antiviruses, or extensions in the browser from phishing and illegal mining.
If you haven't already swich to Linux.
If you are looking for one of the most secure system chose Qubes, what it essentialy does is run every program on it's own virtual machine and by doing this if for instance your browser gets infected other programs have really low posibility of get infected. here is the website check them out:
https://www.qubes-os.org/For some purposes I use clean debian love OS as well.
Don't think that there aren't any malware for linux, there are some of course but far less than for windows which lowers the chances of something even getting installed on your computer. Because there are many distros of Linux it is hard for hacker to write code as mostly he will have to have really good knowledge of some distro and write hack for it, but there is possibility it won't work on other distributions. Since windows is one of the most popular out there people often write malwares for it. With linux if you know what you are doing there is a really low chance to get malware, have to be careful waht you install.
So if you are really interested in security and if your computer can run smoothly on QUBES I'd suggest you to opt for it. You can even have dual boot on computer and do things which you think require more security on linux.