Since the Pixel 4 series no longer gets security updates, GrapheneOS doesn't support it anymore and discourage using it for security purposes:
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GrapheneOS isn't available for anything older than the 6 series.
Graphene is more secure than lineage, but either are way better than stock
Edit: You should really try to even get yourself off of MicroG and not require it.
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Your only option is lineage since it's not getting security updates the other ROMS won't support it
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