Hi, I am Kaushal. I’ve read your description and can see that you’d like to optimize your existing website. I have seen your existing website that and will optimize your website as I have experienced with designing and developing website with customization of core, adding custom functionality, development of custom plugins, API integration and adding payment.
I would love to speak with you further about taking this project on. If you'd like to view my previous work, take a look at my Freelancer Portfolio
Thanks!