Does it has any value a newsletter with 615 emails?

Title.
I have made a quiz website back in 2019. Over the years this site gave me some decent earning, but honestly after I setup the newsletter the first day I lauched this site I never really looked at my mailchimp account again because I thought no one would have joined the newsletter (like my previous experiences teached me)... and after a bit, I forgot about that.

Few minutes ago though, I remembered about this account and I tried to login and I found 615 users. Accumulated over 3 years.
Never sent a single email to them.

Does this has any value? Like, I do not even know how to monetize these people and also these people are from a quiz site so I think they are not trying to buy anything? Also, is the "size" even good to do someting in the first place?
And what if I want to sell this list (without selling the site) what price is this list worth? (just out of curiosity, I'm not saying I'm selling it)

Thanks

615 subscribers = 615 potential sales... day in, day out.... IF you know how to keep them interested in your offers and IF you also offer them quality freebies periodically.

I've purchased so many products and services off people's lists that I've been subscribed to, over the years, that I couldn't even begin to count all of my purchases off email lists. But I've purchased mostly from people who....

1) have not sent me emails every day (as soon as I see idiots doing this I unsubscribe instantly and report them as spammers);
2) have not sent me more than 40-50% promotional emails, but rather some useful content FOR FREE, as well. When you urge people to check out whatever product / service with each email you can rest assured that most of your subscribers will unsubscribe.
3) I usually (but not always) trust, or know to some extent. I don't mean you need to make friends with everyone on the planet, but some level of familiarity should exist between you two, and the guy / girl whose list you're subscribed to should have personally gone out of his / her way to help you before.

But anyway, that's me, like I said (others might not be as fussy and picky as I am, so...)

Now, if I was one of those 615 people on your list and you suddenly sent me a sales pitch after all these years of inactivity I would most likely scratch my head trying to figure out how the hell you are and how you got my email address, or - in case I'd remember you - I'd act on my instinct of the moment and either buy from you, or unsubscribe because I'd feel you have offered me too little value to be suddenly asking me to buy something from you. And had I gone with the purchasing instinct it would probably because the product / service you pitched to me interested me, but if you did it again tomorrow or next week with another product and that one I didn't need I would still unsubscribe

The point I'm trying to make is that email lists are one of the best ways to make money online, but email marketing is not a newbie-friendly method. It requires experience, consistency, and personal involvement to some extent, you need to pamper and motivate your list at all times to keep them warm and interested in your offers, otherwise they're just some names and emails in your autoresponder.

And depending on how much those subscribers are making you per week / month / year you will know what to sell it for. But if you're making money with it you would not sell that list. You usually sell email lists if you completely want to get out of business and have no use for those cash cows anymore, or you're selling a non-responsive list to suckers and newbies who think that buying quality email lists for cheap is a great business investment. But otherwise you keep those subscribers and milk them for as long as they are active (purchase from you)

Thanks!