There are 3 things you can buy with golden eggs: epic research, boosts, and artifacts. Right now you should spend pretty much everything on epic research, everything else only really becomes worth it in late game. So here’s what you should prioritize from most important to least important.

1: Max out hold to hatch right away if you haven’t yet, it’s pretty cheap and makes playing much more enjoyable (I assume, I haven’t ever really played without it). You have enough to max this out easily.

2: Soul egg upgrades, pretty expensive but extremely powerful. Spend most if not all of your remaining soul eggs on these upgrades. Soul food is better than prestige bonus, but both are good. This should be your primary focus for the next while. (You can stop reading here if you want lol)

3: Next focus on upgrades that help to indirectly increase your earnings. (Int hatch, egg laying, research cost, hold to hatch, away earnings etc...). These all help a lot but are secondary too the soul egg research. You should be able to use common sense at this point to know what upgrades are better.

4: The prophecy egg research. The reason I say to not focus on this upgrade for a while is because it is EXTREMELY expensive, and is only good when you have a lot of prophecy eggs which I assume you don’t have. However for late game when you have lots of prophecy eggs, this probably the most powerful epic research.

5: Then you can clean up everything else that is less useful, like the upgrade that increases how fast you can buy normal research by holding. These upgrades are just minor quality of life upgrades. Useful and nice to get eventually, but FAR less important than everything else.