Hi there,
The best way to debug page speed is to use a tool like this: https://gtmetrix.com/
If you plug your website into that, it will analyze it for you.
Then if you check the “Waterfall”, it will show you which files are taking the longest to download.
From what I can see, you have one pretty big image (about half a MB) that could be compressed.
It also seems your server doesn’t have gzip enabled, which would help a lot.
Another thing to check is if your server is using PHP 7.
Your hosting company should be able to help with the last two items there ๐