How do I raise my prices without loosing customers?

I started my business 3 months ago,in hopes of saving money for college. I'm doing many collaborations and I'm getting orders but I recently realised that I'm charging ¼ of the price people from my niche charge. I do like being accessible with prices but the fact that I could be making 4 times more money sounds appealing to say at least. I decided to raise my prices but how am I supposed to do it without loosing my regular customers? Should I just gradually start charging more? I don't know how to do it discreetly since just doubling the prices would make it a big shock,let alone multiplying my current prices by 4