If you keep killing Peace Lily or African violets, try semihydro!
I recently decided to start switching some of my houseplants to "semi hydro" growing.
This is a technique that is often used by orchid growers, where you use clay pellets (often sold under the name hydroton or hydrocorn) or other inert medium in place of soil. In "semi hydro", you keep the clay pellet constantly moist by having the bottom of the pot sit in a resevoir of water. The clay pellets constantly wick up moisture to the plant's roots, but also allow good air flow.
It's too early yet for me to say much about how most of my plants will respond to this experiment, but I can say confidently that Peace Lilies and African violets LOVE it.
Both of these plants are "thirsty", but will rot if you keep them TOO wet. This makes them an excellent candidate for semi hydro, since it allows them to have as much water as they want while still having good air flow at the roots. I used to find both of these plants to be difficult to keep long term (especially because I tend to err on the side of underwatering plants, rather than over watering), but they both are doing really well in semi hydro.
If anyone else on here struggles with these plants, I encourage you to get some clay pellets and try this method. The clay pellets are usually easily found at hydroponic supply stores if you can't find them at your typical garden centers.
(Yes, I know that hydroponic stores have a certain stigma, but there is no reason that typical houseplant gardeners can't use these growing methods.)
Here is a link that might be useful: An orchid forum link that explains the method