I personally did use Mailrise and I might consider setting it up again soon(Currently onlything I really have notifications for are Movie/Series acquisition and when that happens which goes via discord, and Proxmox which just goes directly to my e-mail provider without any proxy. Yes it shouldn't work cuz my provider should reject the mail, but it does so I am not gonna complain about it).
I do also have a sendgrid free plan so i could use that, but I don't like to rely in such cases on other providers I don't have much faith in and that it's not encrypted. Ideally I would have it go via signal but currently the signal API that is available for Apprise(via an external app) doesn't let you send it in a "note to self" fashion and you would need to send from an external number, and sadly I do not have the knowledge of Go to take a shot and try to fix it myself.
I might also look at setting up ntfy.sh again, the handy thing with ntfy.sh is it can be selfhosted with a workaround for push notifications, and what you can do is give each of your family members a specific topic to subscribe to for notifications, and then when mailrise detects that e-mail(let's say father@example.com) it will send it to the topic that belongs to that user. Letting you be able to send password reset "e-mails" etc.