Well, if not having anything to work on the W123 makes you depressed, there are options.

1. What else interests you? Find something to do related to that. Like for example, I like aviation in addition to MBs, so sometimes I'll go to the airport and do some plane spotting.

2. There's always meds? (legal ones!)

3. Purposely break stuff so you'll have to repair it (whoops! silly me, I broke the windshield with this hammer).

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.