Aditya Agarwala believes that the markets are still making higher highs and higher lows, indicating that the trend has not reversed yet. However, the Nifty is facing resistance at the 21,800 level, and if the support levels of 21,600 and 21,500 are broken, there could be a longer correction. Aditya Agarwala suggests that if the Nifty slips below 21,500, it could potentially reach levels of 20,800 or even 20,500. In terms of trading ideas, Aditya recommends buying Infosys and MFSL.