There is nothing in Revelation to interpret.
John was commissioned to write what was, what ‘is’ , and what is to come, and leave nothing out.
The seals are what is in the gap between John and us .
No prophecy can remain forever ‘future.’
Not only Historicists such as yourself, but Preterists would say the same thing. As a futurist, I disagree with both preterists and historicists. I see chapters four through the end of the book prophetic of the end time, NOT ongoing history taking place throughout the last two thousand years.
I also disagree with your interpretation of Rev. 1:19. But we would be getting far afield from what this thread is all about for us to get into a big brouhaha over it. Start a separate thread on it, and we'll discuss it.