Require some modifications in my shopify website

I am planning to sell brass metal handicrafts online. The website is yet to go live now. I'm tied with fund restrictions, but at the same time need high-quality work. I would request you to accordingly bid. Require the following features: 1. WhatsApp chat api linking 2. Minimalist icons. You need to find out and suggest what all the places I should use them. The whole objective is to make my site look neat and professional. Based on this suggestion, I'll be able to decide where to use them. 3. Sale Prices of the products should appear next/ below the MRP (which should be displayed as crossed out) 4. After Contact Us form is submitted by the user and thank you message is displayed to him, he should be redirected to Home Page. Presently, it stays in the contact form only with a thank you message. 5. Any modifications which would add value to my site Thank you!