Unfortunately, you can't detach Lightning from the chain. Channel closures can happen in any non-custodial wallet (especially if you didn't use it for two years). Sweeping requires an on-chain transaction (that was the morning you saw). You will be able to redeem the funds once the mempool settles down.
My 35,000 sats became 15,000 due to a closed channel on Breez. Never ever happened on any other wallet.
And I can't transfer them due to high fees
Lesson learnt the hard way.
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Discussion
Thanks Roy. And as for the future, fees would be higher only, with ordinals in play.
Have considered this dust.
As said lesson learnt. Would advice others with my experience:) good day.