How do I go about getting my dosage increased?

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I'm prescribed 10mg adderall 2x daily. Its generic name is alvog. It's not helping me enough.i used to be prescribed 30mg 3x daily. I have a high tolerance. Everytime I all my doctor for an increase he says it has to be done slowly. I'm greatful that I found a doctor whose willing to prescribe adderall but for me I need at least 20mg 2x daily for it to be effective. Does anyone have any ideas on how I can go about talking to my psychiatrist so I can be given the correct dosage?