You can do a Recovery by entering your old seed into the new Trezor Model T, instead of making a new seed during initial setup. Choose the Recover wallet button (see image below). If you used a Passphrase in your lost Trezor, then you’ll have to remember that too. You can use Trezor Suite or the Trezor Start website to do the Recovery, but since you have a Trezor Model T, I’d advice you to use Trezor Suite.
After you’ve finished the Recovery, your new Trezor will be a mirror copy of your lost Trezor. Remember to enable all the coins you worked with in your lost Trezor so you see the balances. If you used a Passphrase in your lost Trezor, this is the time you’ll need to enter that to access your Hidden wallet.
Now, since it’s possible that someone will find your lost Trezor and hack it or crack the PIN you’ve (hopefully) assigned to use for logins, I’d advice you to move your funds out of the new Trezor temporarily, once you have recovered your funds, and into a wallet in a Software or Online exchange, then wipe and setup your new Trezor again but this time with a new seed. Once the Trezor is set up again with a new seed, you can transfer your funds back to it.
Note: Remember to write down you new seed too!
A better solution is to move all your funds to a second Trezor Model T (after it’s set up with a new seed), instead of to a Software or Online exchange wallet, but that’ll require you to purchase yet another Trezor T.
This requires some manual work, but it’s worth it in an emergency situation, in my opinion.