Wait. https://alltiago.com/ seems to be working just fine. But here’s what I was going to recommend
Yes, but it’s tricky. If you request a DIFFERENT cert, you get to start your count all over again.
What I’d probably recommend is to add www to the hostname so you get certs for both (but maybe you already did that, so you could add a third name, just to get a new cert).
Set up Let’s Encrypt with multiple domains / redirects is supposed to help.