So now I want to convert my whole cash in my bank account to bitcoin but dont know if is a good idea for me or not. I know in crypto world, it will be easy to access my money but the issue is, will my money be same value when I invest all of it in bitcoin .
I don't know how the adoption of Bitcoin is in your area but mine is quite low so if I should convert all my money to Bitcoin I'll end up not being able to purchase anything because no one accepts Bitcoin as a payment method in my side, so I'll advice that you look for a means to withdraw your money from the bank we have POS services that does that without you having to visit your bank
although some charges are added it will be better to have cash than to put your money in banks that restricts how you go about with your spending.
If not for online business, to receive funds from P2P trades and also because I need to debit card to buy coins online I don't see any use for bank.