Let's start this thinking process differently. Over 40+ years fishing I have owned 11 different boats to fit different fishing conditions and my tackle has adjusted accordingly, so behind me, in my room here, sits well over 30 rods that my wife and I fish. Some do not fit my fishing areas now, but I use them when I go on vacation. We have fly fished across much of this country and even on our honeymoon in Calgary, Alberta Canada. Those rods do not fit much of my angling today. We have some very expensive 7 foot G Loomis rods. They are extremely sensitive, light action spinning rods that used to do lots of work when I fish on the Pennsylvania rivers for smallies. We also fished a very deep, clear, PA lake for fresh water white perch, so we setup some 5.5 ultralights and two 7 ft medium rods with line counter reels equipped with 6 pound braid. These look like trolling gear for walleyes, but they were setup to troll for the white perch. Occasionally you would tag into some big walleyes while trolling, so we had to look out when it happened, drag adjustments were critical! Man those fish tasted great! I miss having them in my freezer.
I own 6 different spinning rods that belong to my wife. She regularly fishes these when we fish for light tackle stripers or bass. My arsenal includes 4 spinning combos and about 14 or 15 baitcasters for bass and stripers. I usually have 2 or 3 spinning outfits and maybe 9 or so baitcasters in the rod box on any given day. Here at home in MD. I fish the tidal rivers feeding the Chesapeake Bay. For the most part we are talking dirty off color water, lots of shallow water targets and the term "deep drop off" might refer to 15 feet, unless I am fishing a river channel. Most of my fishing is targeting wood, rock pilings, docks etc. The rods I carry for this are much different than when we go fish out in the TN and KY. Those lakes are deep, 100 foot plus, 60 or 70 mile long impoundments, like Dale Hollow, Center Hill and others. It is easy to see at least 5 to 8 feet down. I can leave my big punching rod and frog rod at home, but I better have a rod for Ned rigs, traps for fishing submerged grass flats, and jerkbaits. Jigs are real important there as well. I am not saying YOU need to invest thousands of dollars or own the numbers of rods we have. Actually I believe 4 or 5 rods can do it all well, if you identify which 5 meet your needs the most.
Here is where we turn the question around. What type of water do you fish? Are they small, slow meandering streams and rivers, Are they big fast major rivers, perhaps ones with commercial traffic on them. Are they small ponds and small local lakes, perhaps drinking reservoirs (these are usually clearer and deeper bodies of waters). Do you fish major impoundments that are miles and miles long. How clear is the water and what are your major fishing targets, perhaps lily pads and heavy vegetation, rocky outcroppings, docks, bridges etc. Are there more smallies than largies or are there both?Do you fish from shore or from a boat and if so what type or configuration. What I mean is is it a jon boat, kayak, aluminum bass boat, or big fiberglass rocket ship. Each type has different storage abilities and restrictions. My aluminum bass boat can handle 13 rods in the rod storage compartment but it can not fit a rod 1 inch over 7 ft. this makes a difference when selecting a punching rod or a frog rod.
All of these answers help determine what fits your needs best, Give me a mental picture of the majority of fishing conditions you will encounter and we can both come up with a plan or strategy,
You already own some good equipment, the next step is learning how to use it best for your conditions and then that will help decide what to add to complement it.
Of course my approach is to identify lures/techniques that work best on each of the rods you already have before moving on. This will require you doing some "practice fishing" with a set of lures on each rod. We can go rod by rod together. This will help you understand what "feels" good on that particular rod. Once we determine what it does well we can determine what we are missing. You biggest need could be a frog rod, a big heavy flipping & punching rod or it might be a second lighter action finesse spinning rod. Perhaps a dedicate jerkbait/topwater rod. I look forward to hearing from you so we can explore your toys and how to make them play. I am sorry if I make you go fishing as homework, but someone has to do it! LOL