Yes, you are eligible to do a Diploma in Naturopathy and Yogic Science (DNYS) even though you are an M.Phil graduate in Biochemistry and a homemaker for the past 12 years.

There is no upper age limit to pursue a DNYS course. The basic eligibility criteria typically include passing Class 12 from a recognized board.

If you are looking for a career change into the field of wellness and natural healthcare, a DNYS course can provide a foundation in naturopathy and yoga principles.
The knowledge and practices learned in a DNYS program can benefit your own health and well-being.

Many institutes offer part-time or weekend DNYS programs that can accommodate your schedule as a homemaker.

After completing a DNYS program, you can explore various career options in the field of wellness and natural healthcare. Here are some possibilities:

• Naturopathy Assistant: You can assist qualified naturopaths in consultations, treatments, and patient care.
  
  
• Yoga Therapist: With additional training and certification, you can work as a yoga therapist to help people with specific health conditions.
  
  
• Wellness Consultant: You can provide guidance on healthy living practices based on naturopathy and yoga principles.
  
  
• Start Your Own Practice: After gaining experience, you can set up your own naturopathy or yoga therapy practice.

https://www.careers360.com/colleges/national-institute-of-naturopathy-pune

I hope it helps!