Welcome to SD.
I think you might be placing too much importance on what this can do for you. Looking at what you have there, a lot of the noise floor is just broadband noise, I assume that came from the transfer medium. Clicks will show up as vertical lines when zoomed in, but pops and crackles are less easy to spot - especially amongst all that noise.
I don't work solely in audio restoration, but I do use noise reduction software for de-noising dialogue fairly regularly. Audition's tools are good, but Izotope RXIzotope RX is pretty much the standard in affordable noise reduction these days. You could try that, watch a few tutorials on YouTube and see if you get better results. Looking at what you have there though, you are never going to get close to anything pristine, just a reduction in noise is all you can hope for.