I’m not a professional and my website is not finish.
My French is a bit rusty but the site looks great and everything seems fine across the breakpoints. Don’t see anything that needs fixing.
Since you have a form on the site, not sure if you any automations linked to it but those can help either thank users and thank them and so they know the submission was received or some other task.
https://support.wix.com/en/article/wix-automations-creating-a-new-automation