There are other services which should work for you as well. I use one which never requires a regular check in. They even ofter a command line curl or other methods to send your updated IP to it. Think Home Assistant, via a curl or if you have a router with Freshtomator or other which supports such curl, it will work as well.
I’ve been using them for a few years now and never ever had an issue with uptime or otherwise. My use is just as a backup in the event my VPS goes down which hosts Pangolin (VPS).
Others such as noip.com and such do work well also.
My wife and I use it for our private discussions. We have a high functioning disabled adult daughter which can not live on her own. Anyway, as her caregivers, it gives us a platform to privately discuss different areas which are necessary, but at the same time triggering to her. (For example, she’s very afraid and severely anxious about fire so if we talk about a fire in a business or in the news, it’s there).
Overall, It’s worked perfectly and no issues!