Considering i am long and currently hold 13 shares in my portfolio (for disclosure purposes) i have and extra buy zone for Tesla included. Normally I wouldn't sell Tesla and would just recommend buying when it goes down, if you are swing trading these are zones that could be useful. The most optimal buy zone is started at 318 and below. Most likely it is unlikely we see Tesla dip that far is still is a possibility that investors would be foolish to not jump on when the time comes. The second zone starts at 319-382. If you would like to add small amounts to your position 393-420. 421-447 is a holding zone and upwards from that is where you should start taking profits