Hi there,
the main issue is the larger number of requests your site is making, most of which are related to the number of adverts being loaded on the page. Each of the adverts makes multiple request to 3rd party servers and loads additional JS files. Reducing the number of adverts would make the biggest improvement.
There are plugins such as Flying Scripts that will allow you to defer the loading of external JS files which may help.
Further reducing requests could be achieved by reducing the number of posts displayed ion Dashboard > Settings > Reading. This won’t have as much of an impact as reducing the ads but may make some improvement.