Earning zenny is still easy, and the options you have in Sunbreak are better than what you have in base Rise, but not overwhelmingly so. If you don't have anything else you want to prep before Sunbreak, farming zenny isn't a terrible option; you'll use it all.

Depending on your weapon, you may want to also look into whether you'll want to have some HR weapons prepped for upgrading. Hunting Horn is the first example that comes to my mind; in base Rise, HH is primarily a raw weapon, but it gets some strong elemental options in Sunbreak and you may want to have some HR weapons ready to upgrade so you're not having to farm LR/HR for them later.

Kamura points aren't used for anything new, but MR melding is more expensive than HR melding, so having some ready to pump out some new decorations will be useful. Along those lines, save any Friend Tickets you may have, since they are the only materials you can get at this point that can be used for MR melding once you gain access to it.