Question about my arms.?

if want improve left hand have avoid using right altogether. ive had same problem before use right hand once week till left caught in speed , power. being both hands gift in boxing. is/was utilized of greats such pacquiao, sugar ray robinson , marvin hagler.

i boxing , good.i right arm dominant , punching right isn't problem because dominant hand.how can make left arm "dominant" too.is bad both hands dominant?or isn't possible?do have tips improve boxing technique?

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