I empathize with all the LT holders including yourself, no one enjoys watching their capital eroded and we all have been there including me, albeit not to the tune of $500k. 20c did seem low and still does. I won't lecture others on risk management but personally I ensure I diversify by minimising any single holding to 10% of my portfolio, even then KTD is currently an annoying blip on my record but not one that doesn't keep me awake at night.
JG/VC may have 'sold out' as you put it but the revenue increase since they did has been encouraging. The current board are improving the business, this is yet to be reflected by the SP which in my opinion will improve in time, how long I don't know.
A2M has left a poor taste in the mouth of many infant/milk formula investors. KTD is well down YOY at -53% however their peers are also generally down over 12m including A2M(-67%), BUB(-52%), BXN(+127%), CLV(+5.5) and NUC(-77%). It is a reality that the Chinese/Australia geopolitical turmoil and COVID impacts on sales have resulted in a sell down generally of the aforementioned stocks. The charts over the last 12m are all very similar when you compare them which tells me the issue may be more industry wide then many here are giving credit for.
There will be light at the end of the tunnel, I hope for all our sake that it comes sooner rather than later. An entry now (which does not fix the challenges for many LT holders) may look very smart once the industry starts to bounce back. Good luck.