It depends. Establishing and claiming a resident state is all about intent. Do you intend to return to MD? I see you still own the property there and your personal things are there. You are also living with your parents which would appear temporary. Where are you registered to vote? What state is your driver's license or vehicle registration? It is the whole of actions you have taken to change your resident state from MD to FL. Here is the MD guide on residency.
On the surface of your question I would say you are still a MD resident as you still appear to be domiciled there. However, if you have taken some other steps not outlined in your question to make FL your resident state then you can certainly make FL your resident state on 31 Dec.
If you determine FL is your resident state on 31 Dec and if you moved to FL in 2023, you would still file a part-year MD return for the time in 2023 residing in MD. In the "My Info" section you would Edit your information to to indicate you lived in another state and select MD and enter the date you established residency in FL.
You would then enter your income as normal in the federal interview. After that in the MD state interview, you would need to allocate to MD only the income received while a resident of MD.
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