Hello, I have a big SEO question. Does changing the current WordPress theme affect its SEO score?

I run a WordPress Website in the Aircooler niche. My website developer changed the WordPress theme, and suddenly, I saw a drop in Google traffic to this site.

I do not understand why Google dropped my WordPress site rank. All I guess is the change in the WordPress theme. Can a WordPress theme affect the SEO score of a website?

A theme change can affect the SEO of a website if it is not SEO-optimized.

Have you felt a higher loading time after changing the WordPress theme? Google loves faster websites. A heavy theme will slow down the website. You can check the loading speed of your website with the following Google tool.
Visit the link and type the URL of your website. Then click the Analyze button. This tool will explain the page loading issues with your websites.

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Check the number of H1 tags on a page. I purchased a WordPress theme recently with multiple H1 tags on a single page. There must be only one H1 tag on a page.

It is a fact that many great WordPress theme developers do not care even the basic SEO. They are either ignorant about the importance of SEO, or they simply do not care.