It is time to Travel and receive demonstrations, if this is an option that can be considered.
Using ones ears is the most valuable method to make prepare for making an upgrade.
The familiarity with the owned TT Set Up will allow a immediacy to identify with an attraction or detractor during an demonstration of an alternative TT Set Up.
If you can make an arrangement with a premises that offers demonstrations to allow you to bring your set up to be used for comparison, this is a very good start, a home demonstration is even better but not as easy to get offered.
Make a Box to transport your TT safely, bring your Phonostage to a premises that has offered a TT demonstration, and have this used during the demonstrations, an alternate Phon' can also be introduced as well to extend the experience.
Transit and time does have a cost, but it is nominal and the absolute fundamental requirement to assess what is attractive to you without laying out large sums to find out the purchase is not too impressive.
Not rushing into this will be good, and if a few items of interest can be discovered through the forum all is well and good.