Those Viltrox (and the Voigtlander) lenses you got are really nice.
If you'd like to experiment with a longer reach, I highly recommend the Fuji 70-300mm. It also has a 67mm thread. It's not razor sharp (but still plenty sharp enough).. in return you get a very compact 100-400mm full frame equivalent thats easy to carry, great colors and rendering, and a solid IBIS for hand-held shots. The autofocus is a little fickle at times.
Check out Dustin Abbots review - he's got level headed take on the lens.
