Hi Martina-
The biggest thing I can see taking a look at your site is that you may have your minification set to Minify Only and not Combine & Minify. Changing this setting should help quite a bit by reducing the number of lookups your site is performing.
Another thing I noticed is that your site gets much better scores depending on the geographic location of the test. Using GTMetrix, if I set it to use a testing server in Europe instead of North America, the scores go up about 10 additional percent. Because of that, you might want to consider getting a CDN to improve global scores.
Getting down further into the technical side, keep in mind that Avada uses quite a lot of JavaScript and other assets depending on what types of content you’re including on the site. For instance, I found 6 different font (.woff) assets, and an overall page size of 3.38MB which is pretty large. Consider optimizing your images and content for a smaller overall page size.