Looking for a robust phone migration tool

When I moved from my S5 to my Pixel a couple of years ago, the Helium app was the only method I could find to transfer all my data (app no longer in the Play Store, etc.) from phone to phone. Now as I contemplate a Pixel 3 purchase, I can't get Helium on my to see my phone. My phone is running Android 9, has an unlocked boot loader, but is not currently rooted. Any recommendations?

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