Listing Form Fix & Error - Improve the performance

I have just applied a fresh layout to the “Submit Listing” page on my site and the form has stopped behaving. At the moment it refuses to submit; no data reaches the database. Top priority is repairing... (Budget: ₹1500 - ₹12500 INR, Jobs: Backend Development, Database Management, HTML, JavaScript, PHP, Stripe, Web Application, Web Development, Website Optimization, WordPress)