First, I would like to mention that this is the reason why wallet backup (recovery seed) is so important. If you had it, gaining access to your funds is very easy.
Great to read you are able to access your wallet in the oldest version of Trezor Suite! Now you need to move all funds from this wallet (without wallet backup) to a new wallet (backed up by a new wallet backup). Please, make sure you have the new wallet backup verified before you move your funds there.
If you have only one Trezor, you will have to use a temporary SW wallet that supports coins you need to move.
Send your coins to another SW wallet of your choice.
Then, after you wipe your Trezor and create a new Trezor wallet with a new wallet backup, you can move the funds from the temporary SW wallet back to the newly created Trezor wallet.
It is really important to keep your wallet backup words safe since only the wallet backup can be used to recover your wallet if your device gets destroyed or misplaced.