You must use preparation for every note you pluck so with that preparation you cannot miss a string or hit another one.
So don't pluck from "air", instead place the finger on the string first, then play. In Pumping Nylon it is called "planting". But don't use it only for acordic playing, use it every time, also when playing Bach: every time the note, which you want to play, is NOT on the same string that is already vibrating, you can/must place/prepare a finger on next string/note.
Sory for poor english and I must say - it is hard to explain, but I have improved my technique for amazing amount with use of this technique.
You must separate hands. People sometimes practice only with left hand and are very careful with left hand fingerings, but they don't make half of that work with right hand. Make a fingering for right hand, practice it on empty strings with preparations mentioned above.
Sounds like a horror practice, and indeed it is, but I find it very helpful.
Of course - years later when you will master that technique, you will/must again play "from air" and "freely" in order not to kill artist inside you - but this time you will never miss anything...