i ran a mobile friendly test on your site.
Looking at the More Info tab it shows that 26 out of 52 resources could not be loaded.
And they all had the ambiguous
Which is Googles way of saying, it couldn’t allocate the necessary resources to load them all.
Now this may just be a case that their servers are real busy, and testing in a day or twos time may result in the site passing.
But whatever you can do to optimize the site ie. minimize the resources it requires the more chance Google will have capacity to load the site.
A major optimization improvement is to NOT load Google Fonts off a google server.
This topic explains how to load them locally:
You may want to ask the plugin author why its loading so many files on the front end. Or find an alternative social sharing plugin.