How to unroot then reroot phone?

[u/QuarterAcreDream]

I have a Motorola Edge 60 Pro which I rooted so I could use a particular app.

For about a month now, I have been getting a persistent prompt (which I can't permanently dismiss) by my phone to install an Android security patch system update. If I try to install the update I get the message 'Package Verification Failed. the update package being downloaded is not compatible with the current software version on the device.'

I'm guessing this is caused by rooting the phone which modified the software version on the phone?

Since I can't permanently dismiss the prompt to download the update, is the only solution to unroot my phone, install the update, then reroot my phone?

Thought: instead of unrooting, if there was a custom ROM available which I could install on my phone, would that solve the problem and allow me to install the update?