She was firm in her decision and insisted on _______________ despite others' opinions.

• Insist on/ upon/ Insist on doing something:
- To keep doing something, especially something that is inconvenient or annoying.
- বাংলায়, কোনো কিছুতে জোর দেয়া বা পীড়াপীড়ি করা ।
- Insist on/ upon এর সাথে verb এর -ing form বসে।

• Example:
- He insisted on my going there.
- She insists on doing everything her own way.
- He insisted on seeing her.

• Complete Sentence She was firm in her decision and insisted on following the new policy despite others' opinions.

Source: Longman Dictionary.