Being spammed to death by one financial newsletter after another

For at least a decade I have had little trouble with spam. But for some strange reason I have started getting spammed to death, starting Dec 25 --

Inheritance Goals
Finance Trader Pro
Morning News Catcher
Wealth Optimizer
The Retirement Savers
Hedge Trader
Breaking Profit News
Breaking Tech Circle
Security Wealth,
Breakthrough Alerts
Rich Market Guru
Market Specialist
Fast Retirements
Market Collapse
AI Tech News

To most of them I immediately unsubscribe, and that's the end of it. But whack-a-mole style, I get a newsletter email from a different organization a day or two later.

For those that have run a day or longer before I unsubscribe, they are all daily or even more than that emails. So just ignoring them isn't an option.

I know the canned advice I've been hearing for decades to just ignore them because by unsubscribing, I'm just verifying that I'm an active email address. But had I maintained that philosophy from the beginning, I'd be getting literally thousands of email a day. I have found it works, in the past, to unsubscribe from anything semi-legitimate. (I do ignore the occasional ones from Russia offering to show dirty pictures though, Nigerian princes and so on ).

But now, for the first time in decades, unsubscribing isn't solving the problem.

They all seem to be using the same spamming service, e.g. when I unsubscribe, it says
"You've successfully been unsubscribed from (name of newsletter) Channel messages."

I've heard of forwarding to spam@uce.gov -- does that do any good?

Block doesn't work reliably on my Outlook 2010 email -- neither does rerouting by address to some other inbox --

Thanks for any ideas

Edited to add - I just sent one of each to spam@uce.gov anyway
Edited to add - All of the ones I sent to spam@uce.gov bounced. "Unable to deliver message after multiple retries, giving up."

I'm just baffled that for at least 10 years, I haven't had much of a spam problem. And then this. I guess I was really wondering if other people are experiencing a sudden huge increase in this in the past month or two -- in particular being put on various email subscription lists for email newsletters of different types. Most of mine have been financial newsletters that I enumerated above. But there have been a few others of different hues: Earth Overshoot, The Cogniciti Team, Conservative Top News.

I guess not.

I'm really focused on trying to cut it off at the source rather than routing an ever-increasing number to a junk folder, particularly given that this thing isn't working reliably in Outlook 2010.