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SiteGround make it absolutely trivial to add a LetsEncrypt free SSL certificate to your server.
Firstly making sure that your domain points to your new site, simply go to Security > SSL Manager then choose LetsEncrypt from the dropdown and press GET
If your server sends out emails with links back to your site (such as password reset) don't forget to change
ASSET_URLin your master/.env file so that it includes https and then redeploy your site so that the new .env is in place.