You need a proper leach field, not just a dry well. Look into companies that will design and install a septic system for you.
build own leech field and [large] septic system.
Besides drilling a new well or fixing the old one?
peterngoodwin: Install a leach line https
Install a leach line https://www.homedepot.com/p/Advanced-Drainage-Systems-16-in-x-34-in-x-76-in-Leaching-Chamber-1600BD/100210614
You HIRE a sanitary engineer or company.