You need to progressive overload the amount of food you eat. Weight moves weight.
If you want some scientific language: at 6’4’’ and 220lbs, your leverage are shit.
I am 8 inches shorter than you and if I wanted to be competitive in powerlifting, I’d shoot for the 220lbs division.
From the article in the previous link.
His calculation was this: the strongest people in the world weigh 3.25-4.57 lbs (roughly 1.5-2 kg) for every inch of height.
At 6’4’', you should be between 247 lbs and 347 pounds.