I haven’t looked at the agreement in question so cannot comment on its value in court.
As for withdrawal, I find it rather strange that your advocate should want to withdraw on the pretext of filing a better draft at this advanced a stage. They should have done the spadework on your behalf before going to court.
I am not aware of the grounds you have taken, but considering this is in all likelihood an eviction proceeding under the local rent-control statute, viz., Jharkhand Buildings (Lease, Rent and Eviction) Control Act, 2000, it must be one of the grounds provided for in Section 11 of the Act. You are perhaps pleading bonafide need. Again I don’t know and can only guess. However, if a new ground has recently emerged—say the building’s condition has deteriorated—you can move an application under Order 6 Rule 17 CPC to amend your plaint, and don’t need to withdraw and file afresh. However, please note that you will have to show that you could not have raised this ground at the time of filing of the suit for reasons beyond your control.
I think what you need is a second opinion and for that someone (either here or offline) will have to look at the papers.
If you lose, you can appeal.
Follow-up queries are welcome.