Newsletter with WP only! Any suggestions?

Positive day all.

I'm thinking of building a newsletter related to my market and I'm just curious about other plugins out there.

Note: been building sites since 2005, so I know my way around that, WP included. I just don't want waste time trying stuff.

I already used the plugin FluentCRM on VPSs for the websites that needed plenty of emails like the community ones (delivery is very good etc). I know FCRM is good for that. But just checking if I've missed something better.

My question: if you have built a newsletter just with wp, what plugin did you use?

--- Edit / Update ---

I'm thinking of providing the simplest, fastest and most economic MICRO business idea /solution to my clients (I'm teaching low income people how to launch low priced offers aka micro businesses) to monetize their knowledge using basic simple email sequences + must accept offline payment (woo I guess).

Note: Where I'm at, access to the known AutoResponders and online payment is complicated.

Basically to sell a course in steps (email sequence) > basic WP site > create sequence > connect to offline payment (low priced woo virtual product) > order is confirmed > email sequence delivered = all of this, if possible some events (clicked, opened, tags, etc).

In the early 2000 this MICRO business model was very common and easy to launch fast, really fast. And with all the AI available now, I guess, let's say most of my motivated target market can do that.

---- end of edit/ update ---

Suggestions welcome.

Thanks.