You need to change the nameservers to the epizy ones, yes. Then check that your website works with the epizy nameservers and follow through with the setup on your control panel.
The epizy nameservers seem to know only CNAMEs for the domain as well. Could that be a Cloudflare partner setup? At this point I’d contact my host but then I suggested that at the beginning already
@sandro the setup with epizy is really weird. I tried them once but was only successful using cname, the config is strange! It is a free hosting service so support is very limited too. I am pretty sure it is not partner setup…
So have you changed the nameservers at your registrar to point at the epizy ones?