You can also pinch off those lower really yellow and smaller leaves. Some look already dead. Keeping them on there causes the plant to stress itself trying to keep it alive.

Definitely add some worm casings to whatever soil you use. It needs some nitrogen. a little bit of this goes a long way. Don’t over do it

Its also probably rootbound so you’ll have to carefully break up the roots when you’re repotting it.

I’d dig a hole somewhere that gets a good amount of sun. Fill it with good soil mix, and plant it

Also get some Epsom salt and sprinkle it on before you water. It should help with the stem purpling.