Witnesses staying in different cities and abroad

As you yourself have said that, "As they are living in different cities and abroad, they are settled in their lives." it is highly doubtful that anybody would turn up to speak in your favour.

There is a practical way to get out of the troubles that you are in.

Unless you have some very strong attraction towards yours wife, approach the court and seek divorce on mutual consent grounds.

She may ask you for a financial settlement for which you may want to negotiate and seek the divorce.

While you handling your case as party-in-person is worth appreciating and the way in which you have explained your issues, it is recommended that you hire an advocate so that your case can be simplified and a logical conclusion is reached.

Do not try to teach her a lesson or make it as your life goal as it will only end up being a waste of your time and resources.