Android devices use sophisticated encryption linked to your specific pattern, PIN, or password. If a "universal pattern" existed, mobile security would be fundamentally broken.
Keep your Google account details in a secure physical location or a password manager.
On very old devices, after several failed attempts, a "Forgot Pattern" button appears. You can unlock the device by signing in with the primary Google account associated with the phone.
If you cannot use the tools above, you must perform a factory reset via Recovery Mode . This will erase all data on the phone (including the lock pattern) but will restore access to the hardware. Note that Factory Reset Protection (FRP) will require you to enter the original Google account email and password once the phone reboots. How to Prevent Future Lockouts