Beauty is in the eye of the beholder.
The vast majority of older coins you will find in circulation are not going to be all that valuable or grade very high.
When you do find a gem, you will know it. You already have started to self grade ...
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It is a 1961 Jefferson and has a very nice shine to it, but only has 2 full visible steps, 4 on the right side under 20X magnification.
So you are developing a taste for what appeals to you. This applies when you are buying as well.
If you are pulling to resell, that is a different subject. In that case you are better off to be a bit conservative with grades and let your customers decide. You will have more satisfied customers.
Personally, I have never bought a
TPG coin and probably never will. The only way I could see myself sending one to get graded would be if it was extremely valuable. But that is me.
I can't say I am any sort of expert but I have been happily collecting coins for over 40 years - buying, trading, selling. Even at that, I consider selling as being "trading"

I'd put your nickel at AU-50. If you can afford it and expect to be around, save it for 20 years and see what it's worth when it's 70 years old. (Or just look at the current value of a common 1941 Nickel in similar condition and how often you see one.)