@Khristie ********
I see. Okay a few points I can suggest based on your reply is that this time if your friend is a foreigner (non-Thai), attach his/her visa, work permit, proof of residence, rent agreement, proof of employment, invitation letter. If Thai, it should have Thai ID number, invitation letter, contact number and address, house address book ( Thais know what that is).
If you don’t have a job presently, you may have the last three payslips before resigning, experience letter which shows your resignation and last working day, ITR ( income tax refund) of last two three years as available.
INR 50k is minimum bank balance requirement, which shouldn’t be just a one off deposit and then there is no transaction history of last two three months. Try to show a good bank statement which has frequent deposits, withdrawals etc to show you have enough going on in your home country to just go as a tourist and not as someone who will misuse a tourist visa to search, gain employment there.
You can attach a hand written self declaration writing your intent to travel, and self declare that even though you don’t have employment, your purpose is to merely use this hiatus as travel holiday to experience Thailand and nothing more, nothing less.
To save some money, you can apply yourself rather than engaging agents.
Also your tourist visa application should be for days more than days allowed by visa on arrival. This means your hotel stay, flight tickets should have gap of more than 15 but less than 60 days.
Good luck!