Guys, do you think top 50 coins will reach there ATH again with next bull run???
Also share your views about any coins out of top 100 which can grow 50x in next bull run

Not sure about the next bull run but when BTC hit a new ATH, I think most of the top 25 alt coins on January 2018, will also hit their new ATH.
Not sure about the new comers (I am not current) but any of the oldies (in crypto world) that are still very active now will surely resurface again. Many of them fall from the limelight but I believe they will surge again.