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How can I fix this LED dimmer circuit?

The circuit reversed blow is a LED dimmer which is driven by 555 timer in astable mode which then drives an op-amp to provide current for the gate of the MOSFET. The circuit dims quite well but it has an issue, when you power it up for a brief moment the LED strip receives non-PWM voltage what results in full brightness and than dims according to the 10K pot position. I was thinking in order to fix this I could remove the 7805 regulator and just replace it with buck converter which powers the PWM circuitry constantly, but I’m asking if there’s maybe more elegant solution here.
led dimmer circuit

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