Gaming monitors usually have an option for an onscreen display. Mine is red or green - which can be of some use depending of your type of colorblindness. I’m sure higher end monitors have more colors.
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https://www.amazon.com/24-inch-FreeSync-Gaming-Monitor-EyeCare/dp/B07HRGVV12/ref=asc_df_B07HRGVV12/?tag=hyprod-20&linkCode=df0&hvadid=309833041189&hvpos=1o1&hvnetw=g&hvrand=8119724092686909132&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=&hvtargid=pla-567544732059&psc=1 This one is great on console - it only needs a 60 Hz refresh rate. But a more expensive one will last for a longer period. This only only has red green options for the onscreen reticle though, which might not be the right color for you.