What can I do?
You could find tools that automate the trying of various combinations of seed-words. Some are mentioned in similar questions here. For example btctools, btcrecover. Use them or adapt them to your needs.
Lost my Bitcoin wallet and have only 11 out of 12 mnemonic seed phrase words. How can I get my Bitcoins?
Need help to recover blpckchain....
Bitpay/Copay use Hierarchical Deterministic wallets so you can find all the adresses that has been generated from your root private key (seed recovery phrase)
Here is a guide with more information: https://github.com/OmniLayer/omniwallet/wiki/Finding-and-Exporting-your-private-key-from-Bitpay-Copay