How can a woman guide her husband who views his actions, which are contrary to Islamic law, as correct, especially given that his behavior has begun to negatively impact her religious commitment?

You must hasten to repent, become righteous, commit to wearing the hijab (definition), abandon singing, associate with righteous women, and frequently supplicate for your husband's guidance during times when prayers are answered. Advise him gently and kindly, seeking help from righteous people and playing impactful audio recordings, while reminding him of the importance of protecting his honor and stirring the depths of his masculinity.