Apparently, you still have two different problems.

The first is the failure to crank. If you have a brand new battery and it still won't turn the engine fast enough to start, you must look at all of your cables and your connections.

You've got two battery connections and a connection at the starter and a connection at the body. All must be cleaned and reinstalled.

As I once asked early in the thread:

What is the battery voltage during cranking?