You can fertilize a little more often... as much as once a week, but if you do, reduce the fertilizer to about half to what it says on the bottle. Orchids really prefer less at any one time. Think about where they grow in nature - hanging from trees, getting tiny amounts of nutrients in rainwater washing through detritus in the canopy.
However, fertilizer is the least important of all of the cultural factors... get the light, temperature, watering and media correct, THEN fertilizer. Think of it as vitamins, not food - all green plants make their own food by photosynthesis. The minerals in the fertilizer they use to grow new tissue... and they grow really slowly so don't need or want much.
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