[sergio1]

You should always strive to have someone pay to make you better.

If you are in a job that is improving your skills that will get you to your next career milestone, great.

Doesn't sound like that is the case, so use the situation to your advantage. Use the spare time to gain practical experience in the skills you have identified for your career ambitions. ( Again, getting someone to pay you to get better, through freelance. )

Having an unchallenging job can make you feel like you are wasting away professionally if you don't have a plan for the future. Being able to say: I want to get job X, and am working to get necessary skills Y & Z, can make you feel better about your short and long term outlook.