Can I migrate from LineageOS to /e/OS?

Yes surely. Welcome to this forum

Related android security patch have to be newer in /e/
If so, try a dirdy flash (from recovery without wiping anithing), if not working, format data before install /e/

If your LOS build is too recent, (regarding security patch date), try to install /e/, but you may have to start from scratch : restore Sony firmware first, then reinstall recovery, and /e/

https://doc.e.foundation/devices/akari/install

[HOWTO] an Unified Install Guide Project for /e/

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