I'm glad that your not coming apart at the seams!
Now as I'm on the other side of the world, I now little of the TRDC, but I would be surprised that it's suffering from a bit of generational change, and with Triumph becoming an extinct marque there will be less new members as the number of cars that are potential candidates drops due some getting scrapped, wrecked, worn out or basically retired to an existence as garage queens. reduces the the number of members that can participate in events.
The members themselves age and wear out, loose interest etc.
As happen with clubs, there is a backbone of members who organise things, eventually their numbers start to dwindle with attrition, before long those left end up burning out and their places often get taken by the type that likes the sound of holding office but don't actually want to do the work, there are less participants in events, so they become less viable.
Less events, equates to less interest, which in turn causes more members to not bother, and so the rot sets in, this is what cause clubs to falter and eventually die out.
All a bit like this forum, I suspect it's on it's last shaky legs and will gasp it's last before long.
Maybe you need to replace the Triumph with something a little younger and with a more active user demographic,
I suggest the MGF/TF which is well catered for by an excellent forum:
https://www.the-t-bar.com/ of which I myself am part of the Admin team.
The cars are a hoot, and affordable, with spares still available. The marque still exists but not really relevant as it is now a vastly different beast.
I don't know what the clubs are like in your part of the world but I imagine they are a bit more active.
"Keep calm, relax, take a deep breath, focus on the problem & PULL THE BLOODY TRIGGER"
'80 Triumph TR7.
'97 Ford Falcon Longreach 'S' ute,
'98 MG-F.
'83 Jaguar XJ6 Sovereign S3.