[eru]

The part of the advice that suggests acquiring more skills is good.

The other part, that suggests doing more courses of study is somewhat questionable.

Uni courses are designed partially to help you learn skills. But also for other requirements.

If OP wants to learn more skills, they should go for that. Whether in uni or outside. If OP wants to relax and have fun, that would also be a good use of time in your twenties.