Well, starting all over again would involve simply adding ammonia, which you are doing, so I say soldier on as you have been - the cycle can and must happen eventually (BrianNY said it first
It can be a very frustrating thing to wait weeks and weeks, but try a "set it and forget it" attitude, just plunking in your ammonia (3 drops sounds light for a 10-gal
, I would put a bit more in there) and don't test it for a while. Before too long, if you are not testing it every day and aren't fretting over it, you will be cycled. It's just gotta happen. Upping the ammonia dose will provide you with tons of bacteria, hopefully more than you will need when you get the fish.