Although our collecting directions are somewhat different, I do feel after completing my Topps 60-69 sets I'm feeling the same as you. I am working to finish my 57-59 sets, but most of the hard work is done and I feel like I just took a big sigh...a good sigh, but a sigh non the less. And certainly not ready for 52-56 mentally...lol (Although I have a decent start)
I'm not a graded card collector, but I am doing a "total chip job" of putting together a PSA 7 & 8 1969 set together, but hardly a focus. Fun to just grab a few here and there.
I am thinking right now I want to focus on cataloging, better binder presentation...just meticulously organize and enjoy what I got for a while.
A little hard to do with your collection, but part of the fun of having binder sets is to grab a beer or two in the evening and thumbing through upgrading commons online. Keeps it fresh, nothing better than getting rid of that card that slipped through your shape expectations, and cheap fun. Ive pulled my 71 Topps set out a dozen times and ALWAYS find a few to upgrade, is that set ever done??