What kind of printer is this? Do you have the marlin settings for your printer? Did you build your own Marlin? Who built the marlin for you? You really need to get the source code of the Marlin for your particular printer and then modify just the Z max pos.
If you are terrified of building Marlin you *might* be able to use this but only if you have a UMO style printer:
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gr5 2,224
Marlin has a feature called "software endstops". This sets the print volume. You need a custom version of Marlin to get this to work.
For example in the code below from Configuration.h you would change the 200 to something larger:
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