Html5 problems

Hello,
i wanna use https://www.bloglovin.com/ with Your theme kopy, but i still get errors with validating on https://validator.w3.org/ (enter https://blog.tadeaskula.cz/) which needs to be withour errors for using bloglovin and showing in search correctly. I also tried without plugins, but still errors. Will it be solved in next update.. or how we manage it to work properly?