You are already burnt out and have given alot over the years. Unless your group partners with another eager group that is highly motivated, well-run and financially ok, to create a completely different organization and different purpose, there's no point.
I know nothing about de-registering an organization in the U.S. But I believe in Canada, one does have to file to the govn't about de-registering --to the original govn't authority that the organization filed as a non-profit organization.
Sorry to hear about this dying organization! I feel for you, the sadness and exhaustion, frustration.
I've been with 2 organizations that each became known in their niche areas and they each died a slow death. lst one was a magazine that specialized on Asian-Canadian, race relations issues and literary writing. I was with the organization for 5 years as part of a volunteer board. We had a paid mailing list of 300 subscribers across North America.
2nd was a women's cycling group in the Metro Toronto area where we had up to 250 women attend our conference and workshops every 2 yrs. Plus we had rides, etc. I was with this organization for 5 years.
Both organizations died because there were no upcoming volunteers with enough drive and savvy to carry on the reins. It does require some leadership even at a low, discreet level and persistence, enthusiasm to carry onward. Like your organization, budget was not a problem. (We had about $3,000 and probably could have secured more through memberships if we worked at it.)
But I am proud to have been with these 2 organizations. I learned so much as a person and met lots of people competent in their areas of expertise. Some of them became good friends for several years thereafter.
In a way, I wouldn't be writing in the style that I write for some of my blogs now, for becoming more outspoken in general, if it hadn't been for volunteering for these 2 organizations. They have both taught me what advocacy means and the power of advocacy, if one is organized, persistent and is armed with fact-based evidence. I also had lots of fun times too.
I'm sure you feel the same way about your experience in the past.