6.2 mo cycle starting 01-Dec-20 (midpoint / top 05-Mar-21)
17 mo cycle starting 23-Mar-20 (midpoint / top 03-Dec-20)
4.5 yr cycle starting 28-May-18 (midpoint / top 20-Aug-20)
9.1 yr cycle starting 18-Apr-16 (midpoint/ top 05-nov-20)
18 yr cycle starting 23-mar-09 (midpoint 25-Mar-18)
All combined indicate significant correction between 1st week of Dec-20 till Mar-21.
For every Elliott wave prediction of 15000 in 3-6 months, there are an equal number (if not more) of Elliott wave analysts predicting start of correction wave. I dont have insights into this topic. Whoever says 15000 in short term may be right from their viewpoint (maybe they are using some specific parameters).
A side note - Given historical mkt behaviour, it is too ambitious to think that markets will put in another 15% in 3 months (mkts dont run too far away from fundamentals for long time). It is possible however that deep correction might not come soon.