Don’t use Discord. That is a major vector for attack. Seen it happen myself.
Even Sandboxed Google Play has problems.
I don’t think there is any equivalent of Graphene for Mac hardware. With Pegasus and Predator software around, phones are very hard to secure.
Rely on tor browser and torrifying where you can with Orbot (Guardian Project).
Instead of Telegram, how about Signal and Briar? We just heard about how Telegram’s executive got hit and may now have to bow to pressure. Signal has kept its design integrity as far as we know.
Minimal apps are better than many to reduce attack surface. Maybe try accessing some of those services on other devices instead of on your personal tracking device.