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Not really, I've never had a Nexus 7 so not sure which is best.
First step would be to try flashing the latest, official firmware (if it's newer than yours). Second would be something custom, LineageOS is the obvious.
Google for instructions for your specific model/year but something like this https://www.getdroidtips.com/lineage-os-15-1-nexus-7/
Flashing new firmware may sort that out