I recall that roughly between 2016 and 2021 the bike wasn't used much.
Probably due carpooling to work and having less time due to becoming a parent.
With having a kid, the vulnerability of riding a bike came more into mind.
At some point in time, the oil came out as clean as I put it in... and also I got sloppy with servicing the bike.
Focus shifted to upgrading multiple Volkswagen Passat 3BG/B5. Highest achievement was a TDI 4Motion upgraded from stock 140 hp to 213 hp using a improved turbo and intercooler (Darkside Developments). Alas, the engine gave up and after I swapped it I got oil in the cooling fluid and it was time to move on (car was from 2005 and getting outdated).
The kids getting much older (me getting more time), carpool died due to covid (much more working from home allowed) resulted in more riding the bike. My sloppy service resulted in: brakes were far from optimal and the fork tube were showing some corrosion / leakage. So, I started with getting it back in shape. One of the things I did around March 2022 was checking the valve clearances:
I always wondered if this would be considered normal wearing marks on a cam?
Around 2023, a nephew bought his first bike and this relighted the fire completely.
It also helped that we had some more money coming in (kids not at daycare anymore and growth of salary due to experience / positive appraisals.