expression, noun which may take the genitive case particle 'no', na-adjective, noun, adverb
a lot more; much more; and then some
Emphasizes a quantity or degree that is significantly greater than what has been mentioned or expected. Often used in comparisons or to express excess.
I want to eat a lot more.
He has much more money.
Combination of the adverb もっと ('more') and the noun/adverb たくさん ('a lot'). The phrase is a straightforward compound with no irregular derivation.