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AFAIK Blue Wallet dropped the Lightning function early last year. But maybe it’s still working for you. I just checked myself, tried to create a Lightning wallet and was unable to. In any case, when the Lightning wallet option existed, you had a separate wallet for it. i.e. there’s the BTC wallet, and the Lightning Bitcoin wallet. If your BTC is in the BTC wallet you can send it directly to Trezor (or anywhere). If it’s in the Lighting wallet you’ll have to do some research. I don’t know much about Lightning network. But I’m guessing neither do you. Unless you transferred some BTC to LN then chances are it’s still in your BTC wallet. So please verify which wallet you bitcoin is in.
I would recommend checking out Sparrow Wallet if you are Bitcoin only. If you had it operating now, you could set up watch only wallets for both Blue Wallet and Trezor. Moving coins between them could be done on a single app. But that’s maybe for later. Best to keep it simple.