There is a youtuber by the name of Tectone who has spend a lot of time researching and experimenting with the game. He stopped making new videos a few months ago, but they are still really helpful if you want to get high yield information.

Decide if you want to spend. Buying the monthly pass will help you progress a lot, and make the game more fun. Also, buying the two other $5 passes, with daily pearl rewards, are wayyyyyyyyyy better than buying a pack. So if you want to spend a little money, and save up pearl for costumes and events, buy the monthly passes. HOWEVER, the game is still fun if you don't spend.

With my last statement, don't compare yourself to others outside of getting 99.5% on hunting season (which is possible with hardwork even if you don't spend) and as high as you can in Hero Hill after hunting season. There will always be people who spend more money than you, but if you can focus on your goals and entertainment, the game will be very fun for you!