It’s definitely understandable to want to stick with what works for you. Since official support for Windows 7 ended in January 2020, Microsoft no longer provides security updates, which can leave your system vulnerable. For a legitimate and safe download, you might need to use installation media from a previously obtained copy or official sources that you already own, as purchasing new licenses or downloads is tricky outside of enterprise agreements.
To keep your system secure, consider using reputable third-party software that can provide security patches, such as those from 0patch. However, be cautious and research extensively before using such services. Additionally, use strong antivirus software, regularly update all your installed applications, and be mindful of online activities.
Ultimately, if possible, consider gradually transitioning to a more recent Windows version to benefit from ongoing security updates and support. Keep an eye out for refurbished PCs with Windows 10 or higher, which might be a cost-effective option for future proofing.