The basis is reduced by distributions. Contribution basis comes out first, followed by conversion basis (if any) and finally earnings.
If you contribute another $50 before the end of 2023, your $200 distribution will be a distribution that consists of your entire $200 of contribution basis, leaving $0 of contribution basis in your Roth IRA(s). Everything left in your Roth IRA(s) will be earnings until you contribute more.
