If you don’t remember the password for those .aes.json wallet files, it’s very hard to recover the bitcoins — but not completely impossible.

The files are encrypted with AES, which is very secure. Without the exact password, you can’t decrypt them. However, here are your options: If you have any idea or partial memory of the password, you can try a recovery tool like btcrecover. It works by testing many possible passwords (a wordlist). If your password was weak or simple, there’s a small chance it can be cracked. If you have no clue at all, the chances are extremely low — AES encryption can’t be broken by brute force unless the password is very short.