Hey @robincsamuel,
In the case of individuals with business/professional income, you can only switch the regimes once. As the new regime is made default from FY 23-24 onwards, you will have to file form 10-IEA to opt for the old regime. You will have to file the same form again to opt out of the old regime. Once opted out, you will not be able to opt back in and will have to continue with the new tax regime for the subsequent FYs.
Here’s a detailed read on Form 10-IEA that might help!
Hope this helps!