You can check the videos showing how to install Let’s Encrypt certificates on GoDaddy (cPanel) with ZeroSSL.com for example. However, keep in mind that it is not an automated process and you would have to repeat the process every 3 months basically. I would probably consider switching to a hosting provider supporting Let’s Encrypt (see the list here) or getting a cheap VPS, on which you would have full control and could install either Certbot or any alternative client you like (you can find quite a few offers on https://lowendbox.com/ for example).
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