I'm trying to enlighten you on a new path with changes for your behavior, so you stop doing same old thing resulting in repeated behavior that never results good for you.
Follow me, I'm a disciplined strategist & I've never been a stuck bag holder, and thing about moves going forward (not past).
Put that old thinking behind you, and don't worry about the past and things such as rolling carry forward capital tax losses from past years.
See my prior post about what to do with your SCIE.
Add to it at my suggested low levels with plan to eventually trade out of it all entirely along with me when I sell (hopefully for higher than today & at a profit).
Even though your first chunk is at a loss you've held a long time, the avg down makes sense. You sell all shares at once eventually (with me later) & the new shares you bought at recent lows can be simultaneously sold at a profit and net results you better.
....Or at the least, plan to exit SCIE with your old long held shares when I eventually sell SCIE at some point later on hopefully presumably higher when this would have a move higher whether a large move or a moderate move....
It's all about changing your old pattern of behavior & thrusting into a new strategic discipline going forward
***Go to my 'Profile' for more information on following me***