Theme Reinstallation and patch the site to it normal condition.

My website has been infected with malware, affecting the entire site. I already clean the server and the site. I need an expert to upload the past backup or reinstall the theme . You need to do the same for both site on Americanbuyingservice.com, Mstarholding.com

Key Requirements:
- Malware and Virus scan and removal on the file and website
- Theme reinstallation from core file or from themeforest of where I had purchase a theme
- Ensuring website security and patch up the site. Make sure that site security is closed and not vulnerability to any virus or malware
- Make the site speed faster and optimized the site
- Fix the css layout, upload image and design the same as it was before it was hack with malware
- Do the multi language THAI-ENGLISH
- Configure email for incoming and outgoing mail to not get block or blacklist
- Make the site responsive for mobile
- update all plugin and remove unuse plugin
- remove bad file out

Ideal Skills:
- Cybersecurity expertise
- Experience with theme reinstallation
- Website maintenance skills
- website design and development on wordpress

Please note that I want to keep the same theme. Bids from freelancers with a strong track record in website security, website design, development and maintenance will be prioritized. Thank you.