How can a husband deal with his religiously uncommitted wife, who does not fast and is not concerned with Ramadan, to make her draw closer to Islam and become devout?

The brother must strive to guide his wife using methods of encouragement and deterrence, connecting her with righteous company, and providing her with beneficial materials. If she does not respond, he may abandon her (in terms of marital intimacy) if it is beneficial. However, if she does not fast and does not pray, she has left Islam, and it is not permissible for her brother to keep her as his wife. The Hadith states that the punishment for someone who breaks their fast before the time of iftar is immense, so what about someone who does not fast at all?