How do you determine which skin products you would 100% repurchase?

I don't know if it's my personality or my skin, but I've never felt like any skin-related product suited me.
That doesn't mean I seriously felt like it didn't suit me.
So, there is no such thing as a skin product that you would 100% repurchase.
If I had to choose a standard, it would be to look for something that doesn't have too strong a scent.
When my aversion to scents was so severe, I couldn't even go to the first floor of a department store.
Or maybe it's because I don't know anything.
Since I don't know anything, I don't know what's good or if anything has changed.
How do other people find such products?