If you have a tin ear, none of this is going to help you turn around a decent product.
If you don't have an ear for pitch, and your instruments are out of tune with themselves and other instruments, your recordings will suffer.
If you are a "producer", and don't have a knack for arrangement, or understand how to incorporate space and silence into an piece, your client's recordings will suffer.
If you are a musician in a band, and you lack the ability to transpose chords, use different inversions, or envision and arrange your parts as pieces of an ensemble, your recordings will suffer.
Before you spend a fortune on things that will expose and highlight deficiencies in your technique and approach, work on identifying deficiencies in your technique and approach. That is, put the horse in front of the cart.
if you honestly can't find anything wrong with your own work, you're not listening.