After spending months with my Expanded HoRyzen build, I've made a handful of upgrades. The first was the RAM; I wanted some RGB and a bit more speed, but could only afford 2666MHz at the time (and it was my only option, the rest sold out). The Thermaltake Riing 20 RGB Plus replaced the stock 200mm fan. It gave the build more pop and spun faster. The RGB controller was definitely useful, I was able to remove my fan splitter and not worry about controlling 3 fans out of sync. Both the RAM and fan were purchased in Newegg.
The next upgrade was the edition of another 3TB HDD. I'm starting to expand my PC library and would need at least another 3TB worth of that. $35 on eBay, again.
Following that upgrade, I went to Microcenter and purchased an Inland Professional 1TB M.2 SSD for $139.99. It's only a x2, but the x4 model was double that so I went with this one. It's definitely faster than my SATA III M.2 and has quadruple the space. I'm more than satisfied with it.
And finally, I wanted a nice monitor (and desk) to complete this stage of the build, so I purchased an LG 27UD68-W 4K Freesync monitor on eBay for $222.50. it was missing the stand so I bought the stand for the 27UD69P-W for another $14.99. My monitor doesn't have the locking mechanism for that stand, but it fits nicely. The sheer weight of the monitor keeps itself in place, anyway. Looking into getting the back panel swapped.
Overall, these upgrades improved the look and performance of the build. I have more upgrades incoming: Radeon VII (still benchmarking it), 32GB RAM @ 3000MHz, more SSDs, and possibly some watercooling.