You might want to look into Unified Push. Although you need to use a Unified Push server that supports the differing Matrix endpoints because for some reason th

You might want to look into Unified Push. Although you need to use a Unified Push server that supports the differing Matrix endpoints because for some reason the Matrix devs decided to do their own thing. I wouldn't call using Unfied push with Matrix reliable, just like nothing with Matrix is ever truly reliable, but it works much better than native notifications for me.