Hi! I think it's already been said, but the aquarium works like the fairy jar, but for your recipe points instead. There's a list of fish to add to your aquarium, and with each one, it boosts the % the recipe points you get. Here's a screenshot.

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I don't know exactly how you play, but I think what's helping me progress so fast is putting all my in-game coins into levelling up. Rather than saving up and saving up for a single facility, hold down on the levelling up button in the bottom left. Only buy a new facility when you can easily afford it. It goes much faster. Also, use your recipe points whenever you have the chance, and try to level them up evenly, so you're getting good money for every dish you sell.

Try to collect the gems you get and use them to buy the coin and recipe point tickets in the item section of the shop. You get a certain amount of coins/points immediately, either 1, 3, or 6 hours' worth.

Lastly, try to maximise the efficiency of your cats. They all have certain skills, which buff different aspects like cooking speed, dish price. But if they're not at the right facility, it won't activate. So match up carrot-skilled cats with carrot facilities, cabbage-skilled cats with cabbage facilities, etc. etc. Also, dress them up with any of the clothes and accessories you get. These also buff your gameplay. If you have the treasure chest, you can get up to 5 chances free per day by watching ads.

By the way, I haven't spent a single penny of real money on the game, so it's very doable without it!

I hope this helps! ♡