As you know, if your website does not start with https, Google will give preference to the ones with it on Google search results. So, in order to make sure that you get a ranking that is decent enough for your performance on Google search, you will need to use an SSL certificate provider who does support adding SSL to your website.
The web hosting industry is very resourceful. There are a lot of providers who will let you add DV, EV etc certificates to your website
Let's Encrypt is a leading name which is funded by internet giants like Google and the likes. It provides your free SSL certificates as well. cPanel now supports adding and renewing SSL certificates through cPanel UI
If you do not have an https tag on your website and still want to be relevant in search results, Let's Encrypt is a good way to start.