In your situation, the company holds most of the cards, including if you are allowed to sell your shares to another party. I would talk with an attorney to see how your share docs are structured, and then explore how to work with the company to get value for your shares. For example, they might let you sell to an investor who really wants in. Keep in mind that the funding round valuation is somewhat irrelevant to you, as that was derived from the price of preferred shares, which have more privileges than your (likely) common shares.
The company will be motivated to do the right thing by you, to avoid litigation and spooking current and prospective employees. You might not get all the value you might have hoped for, but likely most.
The company will be motivated to do the right thing by you, to avoid litigation and spooking current and prospective employees. You might not get all the value you might have hoped for, but likely most.