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Be conscious that star ratings vary from country to country, region to region and indeed from camping organisation to organisation. Be realistic.
For instance, you may have a two star with the local authorities and have a three star in a particular camping guide. Star ratings usually take into account the number of toilets and showers available to a given number of guests; for instance, one toilet to twenty people might deliver a two star and one toilet to forty people might deliver a one star. Be aware then that expansion of the campsite without similar expansion of facilities may lower your star rating. Unfortunately many camping authorities give star ratings for facilities that campers are not interested in, so don't be surprised to find a campsite littered with table tennis tables that no-one is using - the owner is probably just "chasing stars".