From someone who’ve been 23 years in the industry, go out, have fun, and build a network.
Your skills will not take you further, your network will.
Your skills will not take you further, your network will.
You don't want to be 40 and an expert in some legacy technology that even the trailing edge companies are phasing out.
Put another way, if you put in the effort to become a consistently excellent developer, that's most definitely not going to hurt your career prospects. If you're mediocre and cause problems people will be less likely to refer you.