Can you imagine visiting a non-certified therapist? Likely, the answer is no. You wouldn’t want to put your life in the hands of a person who hasn’t got a stamp of approval from authority.
The same applies to Magento eCommerce. Before entrusting someone with an access to your store, all the orders, and hard-earned customers, you’d want to ensure you work with a certified expert.
To assess and recommend or just to tune and fix your eCommerce website, it’s best to work with a Magento 2-certified Solution expert who holds a Magento developer certification.