A couple of years ago, I renewed the three domains I care most about (a three-letter one, my name, and a domain I've had since they were free from hostmaster) for as long as their respective gTLD registries would permit. I figure that plus a script I have that checks them for shenanigans[0] should keep them in good order.

0 - Checks every 30 minutes for changed nameservers, domain contacts, and if the renewal date is less than six months in the future. Texts me immediately if it there's a difference or once a week if no changes noted (so I know the script ran).

Thank you! I don't remember which registrar I used back then, but I wish I had used something like Gandi. I'm using Google domains now

I have Google Domains autorenew my domain for me. Does Gandi have something similar?

I think auto-renewal is quite universal nowadays; the problem is keeping the payment method up to date!

I use Gandi - yes they offer auto-renewal of domains, configurable on a per-domain basis.

Yes

I have a recurring notice every 3 months to remind me to check expirations. Takes a few minutes each season and hasn’t failed till now.