Having already paid too much for it, then started your repair odyssey and you like the car, it seems to me that you should finish up the remaining work as time and money allows; provided that the body is rust free.
Also, if you spend time on this forum learning and you can do some of the work, most of what you need to do is not difficult or very expensive
These old cars need TLC and it will be your personal pain tolerance and corresponding satifaction return that will determine the value of it.

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1981 240D 143k 4 spd manual -SOLD

2004 VW Jetta TDI 5 speed 300k -still driven daily