For that amount of Moon Scrolls, it will take at least 2 weeks for you to obtain it. The fastest way for you to get that amount is to participate in Events actively and accomplish Daily Missions every day. Doing Strong Approaching will automatically give you around 20,000 Moon Scrolls (more or less) and playing Team Interface with a friend that has level 5 friendship level will give you around 10,000 Moon Scrolls (more or less), and both of that are accomplishable just within Monday.

With that, participating in other events and doing daily missions all throughout the week will give you enough Moon Scrolls for you to accomplish that Nature Cultivation and if not, wait for the next week and get more of it. Other features of the game that drops Moon Scrolls are Decisive Bonds, Fighting Matsuri Challenge, Fighting Matsuri Arena, and Arena Missions. Maybe I forgot something, just add it below.

For the Decisive Bonds, as far as I know, you don't have to win the battles but just to enter it. It'll be fast and easy if you will not care about the loses.

Hello!

If you are asking about activating or renewing the Power of the Moon then, no. You have to accưmulate the required amount of Moon Scrolls (30k~50k depends on your level) within the week (Monday to Sunday). It doesn't matter if you spend it or not, as long as you reach the required amount, the Power of the Moon will get activated/renewed (check it at the Daily Practice interface).

Yes, you are right. It will automatically activate once you reach the required amount for Activating the Power of the Moon. You will see the Blue Flame lights up at the top of your Stamina Bar once it gets activated.

No worries, always welcome ..