This will crash markets (lowering your liquidity even more) and make people want to withdraw even more once you reopen.
The situation is made worse because a lot of exchanges issue their own token: CRO in Crypto.com's case. This token provides extra liquidity to your exchange, sometimes in the billions (on paper at least), that you can borrow against. The moment you mention pausing withdrawals, your custom token will crash to the ground and you'll lose a lot of potential liquidity (See Terra/LUNA & FTC/FTT).