Hi,
Let us discuss your listed points one by one.
Adjusting the size of the header: If you decrease your logo height your header height automatically gets decreased. Try this logo https://we.tl/t-PUvb19WUtW. You can crop your images with the help of this tool https://www.photopea.com/.
Adjusting or moving the blue lines beside some titles: Footer title lines?
Can i completely remove the icons at the top of the header? without anything on there?
Try this:
.row.contact-topbar.top-box .col-lg-3.align-self-center {
display: none;
}
Adjusting the blue thing at the bottom? Please share the screenshot.
Also changing the text: Design & Developed by Themespride:
This text cannot be changed. It can be removed then you can add your own text in the “Copyright” section in Customizer.
Let us know your thoughts.
Thanks