I'm afraid you can't do much.
Keep 'em away from known magnetic fields is a good tip said in late '90s, but now two decades later it's ridiculous. Wireless and other EM pollutants filling everything around, you can't expect that floppies would remain intact.
IMHO, mission impossible.
Keep the originals for display only, work out on CF backup strategy and maybe a spare internal A500 drive might be a better option.
