It seems like space is more of a motivating factor in getting rid of done stuff than anything else. Even though I started taking pictures more than fifty years ago, I am still in the accumulation phase. There are many Pentax and Minolta cameras and lenses in my collection. There are many other brands too. At thus stage, I am not interested in certain cameras even though it would be interesting to have some experience with them. The list includes cameras like the Minolta XK and XK Motor, the Canon T90, the Contax RTSIII, the Pentax LX, the Nikon F100 and the Topcon Super DM. Any one of these could become expensive paperweights in an instant. They are difficult or impossible to have repaired. A Canon FTb or a Minolta SRT, or a Nikkormat can usually be repaired. Even though I enjoy using cameras like the Nikon N90S or Canon AE-1 Program or Konica FT-1, I like having mechanical cameras in the same mounts so I always have something to put my lenses on.
You seem to be more connected to the Pentax cameras. If you decide to keep those, try keeping one Minolta camera and a small set of lenses for it. You might sometimes enjoy using them too. Even though my experiences started in 1971, I have in my collection some of the cameras that picture takers older than me started with. These include the Canonflex RM, some F mount Konica SLRs, a Nikkorex F with the 50/2 Tick Mark Nikkor-S, a Minolta SR-7, Pentax H1a and S1a cameras and the Topcon RE Super with the 5.8 cm f/1.4.