How can you nurture expansion after landing key accounts without feeling salesy?

[Scott.T]

We've successfully landed a few key accounts for our B2B service, and now the pressure is on to grow within them. Everyone talks about a land and expand strategy, but it feels awkward to keep pushing for more meetings and upselling after the initial deal is done. How do you nurture that expansion naturally without coming across as salesy or damaging the relationship?