As long as the bitcoins didn't mine all, it will stay at the top, but probably there is a high chance that it will be replaced not today but it will soon.
Maybe I should sell my BTC these days
Selling right now is not a good idea because of this current situation of market you will earn nothing but a low income. For me, do not sell your bitcoin just keep on holding and believing in bitcoin. I hope you will not sell bitcoin and just wait more time.