To be clear: if you have lost 100% of your seed phrase and the device is wiped or broken, the funds are unrecoverable by the laws of mathematics. However, if you are missing a small piece of the puzzle, hope remains.
Partial Seed Phrase Recovery
If you have 22 or 23 words of a 24-word seed phrase, software like BTCRecover can brute-force the remaining words. Because the BIP39 word list is finite (2048 words) and there is a built-in checksum, modern computers can crack the missing words in minutes.
Password Brute Forcing
If you remember 80% of your password (e.g., 'it was my dog's name, a year, and maybe a symbol'), professional crypto recovery services can generate millions of permutations of your guesses to unlock the JSON file. Reputable companies like Wallet Recovery Services charge a percentage, usually 20%, only upon success.
The 'Recovery Hacker' Scam
WARNING: If you post on Reddit, Twitter, or Discord that you lost crypto, you will be messaged by 'Recovery Hackers' claiming they can hack the blockchain to reverse the transaction. This is mathematically impossible. They will ask for an upfront 'server fee' and disappear.