I can’t help you make that weak aura maybe someone else can. In the meantime, I highly recommend you try the very popular ELVUI. Watch the you tube video by ironstar gaming it’s at the top when you search “elvui setup”to see what it looks like. I could not live without this addon is by far the most important. If you ever disable elvui, it reverts back to WoW UI with no issues
The addon completely replaces the standard UI, and The elvui default is So much better than the WoW UI. its very easy to customize with so many options. drag anything anywhere, add new action bars with various size and shapes, change nameplates, unit frames, chat windows, etc.
it won’t let me link the download. Google “ELVUI download” and it’s in the first link called Elvui - Tukui
To install an addon simply download the addon, and copy the folders to your WoW/retail/interface/addons folder. Paste it there.
I create 3 extra action bars, and one of them goes up under characters feet. Drag skills from your book to the bar to see CD’s and Procs. I don’t assign hot keys on that bar it’s just an extra. The bottom three default bars have the skills. You can have as many buttons and rows as you want and change size, font, etc.
I would also get Nug Combo Bar addon from curseforge. It’s lightweight addon, a small horizontal bar with circles that light up indicating how many runes you have. Drag it under your chars feet. It works with a bunch of other classes too.