Hello!
I've read your requirement carefully.
I think I can help with fixing your problems.
Especially, payment problem and speed is my experience field.
I'm a WordPress, and Designing expert over7 years of experience dealing with PHP, MySQL, React, Node, Perl, Angular, CI, and PSD to HTML, woo-commerce, etc.
Especially, my designs are perfect.
I used to design on my own. Everybody says it's wonderful.
I've previously worked on the same project for another employer.
When do you need this finished?
"Quality than Quantity"
I look forward to discussing our project.
Hope to see you!