Bloodstained: Ritual of the Night - HDR Settings

The peak brightness in the game seems to be fixed and not adjustable. This game does not seem to use the PS4, PS5 & Xbox HDR system calibration settings. 

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The peak brightness limit is about 1000 nits. But only rare light sources have a brightness of 1000 nits. Normally, the brightness of the scenes is low, which may cause the image to appear dim.

If your TV's peak brightness is anything other than 1000 nits or the image seems too dim, then use your TV's Tone Mapping modes. 

Other than that, the Brightness slider in HDR mode doesn't seem to work.