Basically you could follow the runners so you get notifications of their runs

Subscribe to them on YouTube and turn on notifications

Follow them on Twitch and turn on notifications

my unofficial app sends a push notification to your phone within minutes if a new PB is posted for a subscribed player.

https://play.google.com/store/apps/details?id=danb.speedrunbrowser

Also theres a place for feedback, its pinned :)