I thought I forgot my password too. It was different than all my usual passwords at the time (because I wanted to be sure it was protected!). I meditated for 14 hours and it came to me in a way that is hard for me to explain.
Try to put yourself back into the mindset of where you were two years ago. Think about what kind of things you were into, what was going on at the time, the personal relationships that you had, etc.. Then delegate the remembering part to your brain. If you try to force your brain to remember then you're only getting in its way. The gentle pressure of intention, combined with persistence and patience.
If you're like me, you've entered this dozens of times before. Sit and look at the password screen, with the same intention as you had every time you unlocked it before. If your work space is different than it used to be, imagine yourself in your old space. Once your fingers start moving in the correct pattern, your fingers might remember first and carry you to the answer.
This was just how it was for me. I hope this helps you too.