Just set the Orbot app to auto-connect on reboot.
Discussion
I was running this for a while. But the battery usage was so intensive I couldn't realistically make it work 😬 is this normal?
OP nostr:nprofile1qqs8d5jes2cgcefqd93f4nvaeuyw5fdwlwye5cv6arq3wl9ust44x6gppemhxue69uhkummn9ekx7mp0strcrl, to answer your question...It is irregular for Amethyst to not retain Tor/Orbot settings. It's the first I've heard of it and haven't experienced it.
What version of Amethyst are you using? Is it from GitHub or Google Play? How old is your Android?
Do you have Orbot installed and operational?