With a large logo that's square with smaller text below, there's just not a whole lot of room for it to spread. Because the graphical element is very large in relation to the text, you'd have to make the logo display quite large for the text to be as big as you want it. You could force the image to be bigger, but it would take up half the page at that point.
A better solution would be to tweak the layout of the logo so it fits the available space better. Either:
a) Shrink the graphical element and increase the relative size of the text so that the text makes up more of the image. For example, the logo here: https://www.shenrent.com/.
OR
b) Move the text to the right of the graphical logo so that it has more room. For example, the logo on: https://www.mauivacationrentalcondo.com/
