Comment by throwpoaster

Very similar situation.

You can think of your equity in terms of buckets: you get some for having the courage to start, some for the grind, and some for future returns. You're giving back the future returns bucket, not the other two. The vesting mechanism imperfectly maps to this.

Keep the equity. It's not "dead" in any real sense (though people will describe it that way to talk the value down). Dilution will hit it anyway. Again: you are already relinquishing the future value when you stop vesting.

If you have a board seat, consider staying in that capacity. Then at the next round perhaps sell the seat and equity to an incoming investor. Early on, board seats are more valuable than stock and selling that package, perhaps at a discount to the incoming valuation, is fairly compelling. Your exit then fits the playbook for exiting early angels -- it's not weird.

Taking cash is a bad signal in a couple of ways: it signals that you don't believe in the new direction and it signals the remaining founder is making poor financial decisions. Unless the framing is that you took a low buyout to walk, which isn't a great look for anyone.

Message it as what's best for the business, and be firm when they ask you to relinquish the equity. You said it very well in your post: "this is a great idea, but I'm not the right fit. I'll stay on in an advisory and governance capacity, but my last day as an officer and employee will be end of next month." Give the company lots of time and help to move on.

Help the company by setting it up to be so valuable that an incoming investor will want to remediate the situation by sweeping you off the cap table (again, like an early angel).

Depending on your counterparties it might not be possible to preserve relationships. Make sure you can afford litigation. Depending on your financial position this means get a new job or start a new business. When someone says, "relinquish or I'll sue" then you generally want to answer "my counsel will accept service at this address: xyz".