I used to have the same problem. Too much external noise.
1) Look in to noise reduction coefficient materials (such as panels, fabric blinds, ) and how best to apply them on walls or around the areas where the most noise is present. Higher rating = better.
2) Hire a contractor to suggest windows that have the best NRC. Double-glazed windows are probably one of the best options.
3) Change when you listen to/enjoy music on your audio system. I have found that midnight to 3 AM is the best time for me. Depending on the weather (such as snow) there may not be as many noisy folks around. Nowadays, noise is not as much of a concern where I live.
4) The "noise" you talk about is obviously normal, and not a cause for concern since almost every neighborhood has this problem. However, higher levIels of external noise in neighborhoods can increase cirme, since thieves are smart enough to know that noise (especially late at night) can mask the sounds associated with someone trying to break in. There is research on this topic and it happened where I used to live (another nice suburb).
5) Buy a solid-wood door and other damping materials (such as an under-door draft blocker and thermal Insulated door curtain).
As for the fridge, best to call a tech and have that fixed.