I might be overstating it, but here's what I see at my company. "Sell" is very different in all of these situations.
- Sell to the champion. - Sell to the rest of the org. - Sell to procurement. - Sell to the implementation project team. - Sell to the users and get adoption up.
Then constantly demonstrate that you're providing value in whatever terms that department / org thinks is valuable that year.
Easy!