SSL certificate error: Let’s Encrypt encountered an error verifying the DNS settings of your domain name. Please double check your nameserver settings and try again later.
Looks like you have only added 1 Nameserver at Freenom, try to add both ns1.epizy.com & ns2.epizy.com .
Once both are added, wait for 15-60 minutes. Then go to InfinityFree Cpanel and approach to CNAME there, and both CNAME of Let’sEncrypt there.