Anime Movie Recs for someone who has only watched three before?

Since you have already watched Spirited Away, a masterpiece of Studio Ghibli, You can watch other Ghibli films now
Howl's Moving Castle
Mononoke Hime
My Neighbour Totoro
Grave of the Fireflies
The Secret World of Arrietty 
The Wind Rises
From up on Poppy Hill
Omoide Poroporo
Whisper of the Heart

Along with these, you can start watching Makoto Shinkai's films. Shinkai's films are known for their breathtaking art style and visuals, and of course, stories.
Kimi no Na wa.
5 Centimeters Per Second  
Kotonoha no Niwa  - My most favorite makoto shinkai film
Hoshi wo Ou Kodomo

And other masterpieces 
Koe no Katachi 
Toki wo Kakeru Shoujo 
Hotarubi no Mori e 
Paprika
Summer Wars 

my fav this year so far....

Totsukuni no Shoujo (2022)

I'd also recommend any of  |  these