They are too wet. And plant in 2nd/3rd photo is etiolated. They need well draining potting mix, containers with drainage and good sunlight. The leaves may be too wet - from as many as I see there you should have plenty of starts (not every one will grow, but most do). Plants in last 2 photos are also planted too low/deep in the pot.

Yeah I noticed the echeveria was etiolated so I moved all my succulents outdoors into shade so they can get used to being outside because I also read it's better for them to be outdoors. I'm still new to keeping succulents, and the echeveria is one of my first succulents so it's still a learning process.

What do you mean by the ones in the last 2 photos being planted too low/deep? Should I add more dirt or plant the stem more into the dirt? I tried not to bury the leaves because they're touching the dirt.

They are sitting well below the rim of the pot, do not bury plant but add more potting mix before plants are planted, they will have better air circulation. But pls. get them out of that water retaining soil.

Ok, I see. As for the soil, I'm using Black Gold Cactus Mix that was recommended to me by my local nursery. Is that a good brand? I don't know too much of the brands, and mixing my own soil seemed confusing and pricey. But I'm going to buy some perlite to mix in with the soil.

Ok, thank you. So nurseries are similar to pet stores where employees may not always know what they're doing? Hopefully the perlite will arrive tomorrow so I can mix it in with all the soil and see some change. For now I'm waiting for the rainy weather to pass by the end of this week so I can move everything outdoors.

Very much so Skylar, and don't get to down if your echeveria doesn't make it! Those in my opinion are very hard to keep alive when first learning about succulents. I used Rinas suggestion in the beginning of the perlite cactus soil ratio and it helped get me through.. I am still very new and haven't been able to get a true gritty mix yet. However this forum is amazingly helpful with a lot of awesome succulent lovers willing to lend some wisdom along the way. Enjoy the learning experience and don't give up its worth the effort! Blessings Mary