I live in an area full of snakes, black and mostly brown
Been trying everything for years, lost plenty of pets and almost a kid
Bird netting works,but has to be the non woven type, often they come in for water, can put some around troughs and drinkers and they get caught. Watch out as often they re still alive and need some massage with shovel. Also bit hard to get them out of the netting.
There is a push to restrict it as it is too effective.
Guinea fowl dont do much, my parents have 20x and snake repellers and neither stop them turning up.
Best we have found is sacrificial cats, snakes really dont like them. Still live with us but free shed cats work pretty well. Keep them fed and they dont bother wildlife much
Other story i have is for a fact black snakes eat browns, pulled a 1m brown snake from inside 1.1m black few weeks ago. Bluetongues are helpful too Im told.