I published a new site yesterday to replace and old site. The new site it up but it only shows with HTTP not HTTPS.

I published a new site yesterday to replace and old site. The new site it up but it only shows with HTTP not HTTPS. This is a huge problem. Since google has my old site index with HTTPS my new site is not coming up when I do a google search. My old site is #1 on Google for over 10 years. I am worried that this is going to cause a big problem. Please find a way to update my new site. The new site must mach the old URL with HTTPS. Thank yo !