Diversify.
Players are finished leveling professions, supposedly there is a drop in the player base now that returning players have seen the new content, and demand for raw materials is simply decreasing as a result, with prices starting to normalize to the "standard" levels for this expansion.
Flasks and potions might now start breaking even or turning a profit, so look into investing more into them. Check herb prices on your server, dreamleaf from Legion might still be valuable to scribes making glyphs. Consider dropping herbalism for a second crafting profession or level a DH alt (starts at 98) if this is your only character.
Hopefully others can chime in with additional ideas.