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I have turned my phone off then on and I can't remember what my password is when I turn my phone back on. Is there anything in can do?
I'm afraid you have a serious problem there.
You don't have fingerprint recognition?
The manual tells us this.
So sorry for you.
PS Maybe you can try some more possible passwords, hope one is the right one.
Hi @Pin4, sorry to hear about this. 
I'm afraid that there is not that much to test. Is your current screen lock a PIN code? If it is, you can try and use the Google service called Find My Device, to add a new screen lock on your device.
If that doesn't work of you have a password or pattern screen lock, you will need to perform a software repair using Xperia Companion. This will completely wipe the device and in the same process, remove any screen lock.
@Strampke, when you turn the device on, you can't use the fingerprint to unlock the device, it has to be with the PIN, pattern or password.