If you've been making regular museum donations and have a painting in there, you'll catch Blathers as soon as you're able during your daily fossil assessment run.
Just make sure you take care of that before doing your mayoral stuff so you don't have another public works project already on the go that day.
I think littering your house with "lucky items" help wonders with your score. Plus complete sets. I'm not sure beyond those.
There's only a select number of those and the seasonal ones rotate out.
I should have lied about my birthdate so I could have gotten some of those goodies before December.
I've got my Mermaid + Lucky Fish room completed with Napoleonfish, Sweetfish and Giant Snakehead swimming in aquariums.
Going to start my Cabana Furniture room on the main floor and stockpile lucky cicadas in July.
Balloon Furniture in Room 4... although I'm far enough along in the Robo series that I may be able to ride that instead through trading.
Main room is my "max out my feng shui" emporium.
But even adopting all of those strategies 1.1 million HHA points seems daunting.
I'm going to need to start grilling my villagers for their pictures. Then summarily booting them out of town to bring in fresh meat.