To try to brute force it you should check hashcat. There are some pretty useful rules

You can also use hashcat to try to recover your password. In case you were lost with command line and rules in hashcat, we can provide assistance

Recovering this 26-word mnemonic phrase, assuming it follows BIP-39 and only knowing the order of 6 words, would take too much time to brute force and would be insufficient. To recover it, you should try to reduce the number of possibilities by, for example, gaining knowledge about the order of the remaining 14 words. This would significantly lower the number of possibilities and increase the chances of successfully recovering it through brute force. Otherwise the numbers are way too big

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/Peter

If I were you, I’d definitely look into using an open-source device like Trezor or Passport. The way to go is to have a hot wallet (or a few) for your daily stuff and a cold wallet like Trezor for the bigger crypto stash. For hot wallets it depends what you need, but you can check out options like MetaMask, Electrum or Trust Wallet (which is partially open-source).