Ditto with all comments

I just looked at your index page where you have the title as
Who is speaking & what can I learn

You could make the title more descriptive to your page content.
Looking at your page, I think you could have the title of the index page as

Seminar Boost - Seminars. Workshops, Bootcamps, Courses

The spy bots will "know" what your page is about.

Similarly, with all other pages.