Scorpion Solitaire is difficult. What else can I say?
There are two things to note in Scorpion: groups of cards can be moved and dropped wherever the top-most card in the group can be placed. E.g a group of cards starting with a Four of diamonds can be placed on a three of Diamonds.
It is only possible to place a King in an empty Tableau space. However, the Reserve cards will be dealt into an empty space whatever their value. This may sometimes work to your advantage.
I prefer Wasp (Relaxed Scorpion or maybe Scorpion Relaxed) and some of the easier Scorpion variants.