i want to change the my website theme

I have a WordPress website that has generatepress premium theme, but my site speed is not good that why I want to change my website theme, Please check my site and recommend me any fast and good structured theme.

There’re hundreds/thousands of theme at the marketplace as well as some of the free themes may be an option for you.

I have a query. I am willing to create a website like this best ac dc tig welder reviews site. But I am confused about the selection of the theme. What you will prefer for blog websites.