Technical seo, cls, lpc, speed up magento

Hi! We have a engraving company in the Netherland. And looking for someone that can help us fix some issues with our magento 2 store.

We have this issues:

- CLS problems
- LPC problems
- Sitemap issues
- speed in ggogle pagespeed is poor also in gt metrix
- cronjob is not working

We are looking for a freelancer that can help us!