There's the old "failing to plan is planning to fail"
But this is actually planning to fail. Sorry to say - I'm sure things looked very different when you switched horses. That market is a historical aberrancy.

50 hours/year is better than zero, but I wouldn't call it staying current from an aviation hiring perspective.
Also, historically, full-time CFI itself was a weak application.

If you really want to go to the airlines, you have to find a way to fly full-time, hundreds of hours per year. And you need to be moving up to something bigger than a trainer.

Sorry