Hold the Power button for 30 seconds until the screen goes completely black and any lights turn off, even if it looks like it's just sitting at a black screen. This clears any stuck boot state before you try again.
Press Volume-Up held + tap Power to enter UEFI
If you cannot even enter UEFI, the issue may be hardware related.
A normal Windows 11 ISO is not always the best choice for Surface devices. Microsoft provides model-specific recovery images that include the correct drivers and firmware.
You'll need another PC to:
Download the Surface Recovery Image for your exact model.
Create the recovery USB (at least 16 GB).