Interesting theme, but not useful, maybe you can change the nav menu position.
Typographical improvements will be good choice and also improve the footer appearance and try to remove border radius of the boxes.
I think you have a good start but some points need to improve like social icons.
You can use a fancy font for your headings, also try to add a clients section to your homepage.
You should add a footer section to you design.
Increase the paragraphs line height.
Black color is not good for your design on the footer.