First you need to extract the hash(*) from your encrypted 7z:
1) via offline tool https://github.com/openwall/john/blob/bl...7z2john.pl
2) or via online tool
Then use hashcat mode 11600 (7-Zip) to try to crack it.
(*) sample hash : (password hashcat) : $7z$0$19$0$salt$8$f6196259a7326e3f0000000000000000$185065650$112$98$f3bc2a88062c419a25acd40c0c2d75421cf23263f69c51b13f9b1aada41a8a09f9adeae45d67c60b56aad338f20c0dcc5eb811c7a61128ee0746f922cdb9c59096869f341c7a9cb1ac7bb7d771f546b82cf4e6f11a5ecd4b61751e4d8de66dd6e2dfb5b7d1022d2211e2d66ea1703f96
1) via offline tool https://github.com/openwall/john/blob/bl...7z2john.pl
2) or via online tool
Then use hashcat mode 11600 (7-Zip) to try to crack it.
(*) sample hash : (password hashcat) : $7z$0$19$0$salt$8$f6196259a7326e3f0000000000000000$185065650$112$98$f3bc2a88062c419a25acd40c0c2d75421cf23263f69c51b13f9b1aada41a8a09f9adeae45d67c60b56aad338f20c0dcc5eb811c7a61128ee0746f922cdb9c59096869f341c7a9cb1ac7bb7d771f546b82cf4e6f11a5ecd4b61751e4d8de66dd6e2dfb5b7d1022d2211e2d66ea1703f96