No, the rituals should be cast ASAP. You only really need to interfere with other races rituals if they are ahead of you. I am not bothering until the High Elves get to the last ritual or two. Then, even if I am not in contact with them yet, I will spam the hell out of those intervention armies.
You may have wasted some energy on your northern campaign against the dark elves, because their lands are unsuitable for your expansion. I’ve just been maintaining the Ruins directly north of the Mirror Pools, or whatever that north most province of Mazdamundi’s is called. I really like the new “suitability” system where if you are driven or desperate, you can colonize other habitats, but with a hit commensurate with how unsuitable it is for you.
I’ve been focusing on expanding south. I’ve left the humans as trading partners, and since we share anti-corruption goals, the shared provinces remain stable. Mazdamundi begins in the “neck” of that continent, and the rich belly lies south. I’m about to hit another Ritual Resource generating province, so that will hopefully bring me up to speed with the High Elves again. Dark elves are well behind and I think I am killing off the ratmen faction which hasn’t even completed the first ritual yet.
Exploring the surrounding waters is also profitable. One site gave me 10,000 gold. I’ve gotten a number of magic items from others. Treasure Hunting ruins is also important, as I received 250 Ritual Resources from one successful Treasure Hunt.
You can try to achieve a Confederation with the other lizard races, or just conquer them. I haven’t done much with them yet.
TLDR- keep the northern Dark Elves at bay, but expand south for the win.