Margin increase for the short position everyday for weekly contact

Hi Friends, i took a trade on Thursday, the margin value is getting increased slightly every day and end up with 1.2x on the expiry day. Eg: 1.2L to 1.4L. this is causing the margin short fall. Any tool avala to calculate the expiry day marginal instead of current day marginal?
I am adding fund every day after taking the position.
Here consider the nifty is not moving anywhere and position are otm. I understand there is a point of position are otm.

There will be no tool as margin can change based on volatility and changes in underlying, so it is always better to maintain 15 to 20% extra cash instead utilizing 100% towards margin.

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