Congrats on your nice system and happy to chime in with my suggestions on ways forward. As a prior owner of both the Gyro and the SME IV I’ve been in exactly your position. I actually changed my Gyro for a first generation Orbe and then added the HR supply and a wall shelf (GrandPrix Audio Brooklands) both of which really helped so I imagine the Gyro upgrades you have in line will all be positive
However where I would focus most attention if I was in your shoes would be In swapping out the arm. The IV has a very dry and even rough sound and it was only when I changed mine (first to a Triplanar VII and then to a Durand Kairos) that I realized how much it was coloring the sound. I’d sell yours and explore alternatives, personally my taste now runs to unipivots such as the Kairos but Moerch arms are another classic combination with Michell turntables
With an upgraded table and a better arm you can then explore cartridges - anyway hope this helps and let us know if you have any more questions
However where I would focus most attention if I was in your shoes would be In swapping out the arm. The IV has a very dry and even rough sound and it was only when I changed mine (first to a Triplanar VII and then to a Durand Kairos) that I realized how much it was coloring the sound. I’d sell yours and explore alternatives, personally my taste now runs to unipivots such as the Kairos but Moerch arms are another classic combination with Michell turntables
With an upgraded table and a better arm you can then explore cartridges - anyway hope this helps and let us know if you have any more questions