idk what to do with myself while we wait for season 2

You won't be waiting long since the raws have been waiting since February

Re-read this manhwa again or read tge 4 parts of this manhwa's novel

Or wait for King's Maker season 2 which starts from 1st june 2019 ( if you haven't read the season 1 then start season 1 instead it's really good.)

Or i can recommend you good manhwas (korean) and manuas (Chinese) if you want. (=・ω・=)

The novel of Walk on Water has 4 parts but are in korean language. If you the language then read them.