Picking up on others’ comments, a website about writing (poetry) is compromised when the writing on the site is less than immaculate.
The unusual and erratic capitalization is especially awkward. In a site devoted to poetry, there’s room for taking artistic liberties with the language. Even so, those artistic exceptions need to be consistently applied and contribute to the general personality of the site rather than appearing as oddities that draw attention to themselves.
It seems that you’re inserting a couple of pixels of CSS letter spacing to the Montserrat body copy. It’s almost always looks wrong (can’t think of any exceptions) to letter space or track out body copy. For that matter, I’d likely use another typeface altogether. Montserrat is a nice typeface, but its geometric proportions make it seem a little mechanical and hard-edged for a poetry site.
At your mobile widths, in the hamburger menu, the CSS hovers are causing the type to display as white on white.
The edges of the logo are just a bit ragged and not well anti-aliased into the background color, which I’m guessing is a problem with how you created the PNG transparency. For something like this, it would be better to use an SVG file than a PNG. If it were me, I would also have used a typeface that better matched the logo to spell out “Poetry’s Purpose” (with the right apostrophe, of course).
What does the globe with the “Hold On” words mean?
There are quite a few other little problems throughout the site, like those having to do with punctuation and paragraph spacing.
From a UX point of view, if I visited the site for the first time, I’d need to dig a bit to figure out what the site was about and how much the poems cost and how it all related to donating money. Reading through the site answers all these questions, but most people who are only casually interested don’t take the time to decipher things like this that aren’t immediately apparent to them at first or second glance. If it were me, I’d likely reduce the space allocated to what is essentially a full-panel blue-green background into and devote more space to quickly and concisely telling visitors what the site is and how it works in just a bit more detail than you have.
All these things might seem relatively minor, and most are, but cumulatively they add up.