The best way to fix the issue of master key and fix the whole issue is to reach out to the XRP community. The community provides support and resources to help users with their master key issues. To reach out to the XRP community, you can visit their website at https://ripple.com/xrp/. On the website, you can find information about the XRP community, including forums, blogs, and other resources. Additionally, you can contact the XRP community directly via their support page to get help with your master key issue. With the help of the XRP community, you should be able to resolve your master key issue and get back to using XRP.