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As long as the phone belongs to you and meets the criteria either MyXperia or Android Device Manager is the only solution
Other than that you will lose everything unless the phone it's encrypted
What do you mean by other solutions on 4.4 and lower? there aren't, if you forgot the password on your device, and if doesn't meet the criteria on that guide, there's nothing that can be done, that's to protect your private data in case someone get a hold of your phone.
Try log-in to your Google account in your desktop or another device and to go their android device manager page, you can usually, lock, erase or locate. Once the phone is on Wi-Fi or mobile data internet access then it should be found. Just lock the device remotely and unlock on the phone, I think I used that one and you can set a new pattern or password.
It's to protect your private data, how come it's not working? does your phone meet the criteria listed in that guide?