While there aren't any new releases at this point, you could use Obtanium and point it to the repos for the apps you use. That way, you'd get notified once the releases start and you'd get them right from the developers.
The best thing I ever did with home automation and children is to setup motion sensors in the hallway and tie it to my WLED strips. If anyone in the house leaves a bedroom at night, led light strips in the hallway, along the stairs, and downstairs turn on low and red for 5 minutes. There's no turning on lights or forgetting to turn them off. It's bright enough to see but not so bright that is jarring. Also, using red light doesn't kill your night vision when you go back to a dark room.
Take a look at the models that Gadgetbridge supports. Your data stays on your phone. There are no servers to connect to. You should have roughly the same experience on any Android device.
As for tracking sport sessions, look at what each model offers. I use it to sync my PineTime and Mi Smart Band 7.
I really like using the features that Mi Smart Band 7 has to offer AND knowing my data stays on my phone instead of going to servers in China.
Caveat: Recent Amazfit/Mi devices have needed you to set up the device in their proprietary app first to generate a pairing key.
Something worth noting is that F-Droid is both an app to download other apps but they also maintains a repository of apps. You can use alternative store apps (like Droid-ify) with the F-Droid repository OR you could use the F-Droid app with a different repository (like IzzyOnDroid). You can mix and match to meet your needs.
I use the Droid-ify app with the F-Droid, IzzyOnDroid, microG, NewPipe, and Collabora repositories.
Once you start down this rabbit hole, give Obtanium a look.
Alright. Let's get the ratgdo guy on this. I'd pre-order a rathvac today.