In reply to Carlos.

Yes, of course, you can keep the contents. The theme is really about the design. Some things might need tweaking afterward, but you wouldn't frequently change the theme. That's something to do every 5-7 years when the current one starts to look outdated. I found that when I tried to use a Blocks theme, I was never able to get it to look as professional as the traditional themes using WP Bakery. My clients need their websites to look polished.