And I would like to reiterate that, if you don't know enough about the game to make good suggestions (or if you're in a realm that "does everything right"), personal correspondence is still useful and important.
I'd argue that, really, in most realms, suggestions help people get positions not because of the idea's merit, but because it "signals" to "voters" (usually lords) that the person in question is involved, thinking, and interested. However, any substantive correspondence will probably succeed in demonstrating this.
So, if you don't have a bold new plan for the realm, don't fret. Still talk. Don't stay dumb crap, but do make contact.