=> When I clicked on your site link va.v.liveperson.net hangs and suspends loading of the site. I don't see the deault Twenty Seventeen theme your Pingdom test is reflecting...
=> Then we are loading a bunch of stuff from blaszok.mpcthemes.net which was hanging.
=> GTMetrix shows most of the sluggishness is due to images. Your images are thousands of pixels in size and then the code is displaying them in a much smaller size. Upload and use images in the sizes they'll display in. Then optimize those images. The first 6 items in the GTM report are all things in your control to control.
Judith "If you think you dare not, you don’t.." ~ Napoleon Hill