I see I am not alone in deploring the decline in watchability of Doctor Who with the 2018 season. The series rose to absolute brilliance with many of the episodes of the David Tennant and Matt Smith incumbency. Although I loved both of them as Doctor Who, the real excellence was in the scripts, full of wit and whimsy allowing the characters to engage your interest, love even! Some of the stories were good too, but even if they were a bit feeble the ongoing stories of the Doctor and his companions carried you on. The enigma of the Doctor is the main interest together with the paradoxes of the time jumping. I just put up with the snarling monsters and special effects!
The current series completely lacks the wit and whimsy. How can anyone criticise Jodie Whittaker as the Doctor when she is not given anything interesting to say? The stories are complex and the action convoluted. I can't and don't follow them to the end of the episodes, and only my long history as a Doctor Who fan keeps me watching at all.
I don't say bring back Stephen Moffat as writer because despite his absolute brilliance at his best, I think he was losing interest. But please, please find a new writer who can put something in the mouths of the Doctor and his companions that is entertaining. A good story wouldn't hurt either!
Failing these I'm afraid we may be looking at the last series of Doctor Who. I'm 68 so may not last long enough to see another revival.