Have crvibBTC now what?

Any suggestion how to convert funds - from ibBTC / crvsBTC LP - back into btc?

Withdrawing from the LP provides ‘crvibBTC’ but now Im unsure how to swap back to btc. Any help would be most appreciative.

When you withdraw you get CRV-LP from the ibBTC position, you can withdraw those for wBTC, renBTC, wibBTC or sBTC in Curve.fi. From there you have multiple ways of going back to BTC like getting renBTC and bridging it back to BTC, using an exchange to deposit wBTC, etc.