You can't change it - you can only be accepted into it.
So not only you have to do something extraordinary, someone from the caste needs to like what you did.
Or you could be born into it...
I think you're confused about what this honour actually is. Receiving an OBE doesn't imbue any extra rights or powers, it's literally just an award for doing something that helps others. That's specifically what it was created for.
You can't be born into it, and the system has traditionally honoured thousands of 'normal' people that have been nominated, usually by their peers, for doing work in their field or community.
As you can see, some of them are themselves honours recipients, and some are not.
In no sense is this a self-awarding organisation - and the only reason there are so many recipients on the committee is because honours are given out to just about everybody who has achieved anything of note.
@migstopheles I wasn't talking about being born into OBE, but about being born into British aristocracy. I admit that OBE is just a small part of the whole system of honors, but by using titles and heraldry it still helps to keep the caste system alive in the GB.
There is no caste system in the UK. There was a class system that is largley defunced, despite pretestations to the contrary. You aren't even British, so why do you care?