If working on your old vintage bike isn't fun on some level. You should not have it, imo, as it now owns you.
If it is just another tool to move your butt from A to B. Modern ones with warranty service do that without you having to do any work on it.
Perhaps you need to revisit your priorities? Vintages bikes are never finished with routine maintenance. If that makes you miserable, why have it at all?
I dare you. List all the reasons why you still own this bike.