Job
By 30 you may already have a good idea of the kind of work you like and don't like doing, along with the kind that you're naturally suited for. The next step is to be sure you're in an industry you care about and that has room for growth, both in salary and responsibilities. When you're working in your 20s, being a generalist is great advice. But as you move into your 30s, it will become progressively harder to maintain being a generalist. So if you haven't already, start specializing in one aspect of a job, or you'll run the risk of not being marketable in your next job. Look at how your own department is structured, and try to see what groove you might best fit into, then try to make that your groove.
Money
The best advice I ever got in this department when I was 30ish was two-fold. First, try to accumulate 2 months worth of total household income in a bank account (or cash) that you don't regularly think about or touch. You will use that fund to survive on if/when you become unemployed or for unexpected payments/disasters that will happen. Once you're on your feet again, repay that fund back to the 2 months value. I've done this for the past 10 years and it's been a lifesaver, even if we hardly ever have needed it, knowing that there's a solid financial floor under you will help you sleep better at night.
Second, map out when you'd like to retire, and put down some money toward it through your employer, like a 401(k). It would be hypocritical of me to advise more than that, because I haven't done more than that. But I'm beginning to recognize how important it is. Money was too tight in my house to give anything but the most meager of % toward it until I was around 35. I had 2 jobs where I went without it because the companies wouldn't match even a fraction of what I invested. I started late... and it doesn't feel great. So that's why I advise starting earlier and just treating that part of your income as auto-deducted from your paycheck. It might be a pain now, but you'll (probably) feel better knowing you have a backup plan.
Family
It's hard to give advice on this, because this isn't for everyone. If you do want a family, it's naturally a big topic that will dominate your biggest life choices. My wife and I have been together for 20 years now (as of this week, actually), and we had our first kid when I was 30. I know of maybe 5 couples in my personal life who haven't gone through divorce or major marriage troubles. I think certain people work better together than others, and it's often impossible to see how that will go until you weather your first few disasters together. It's simply luck if you end up with someone you're both attracted to AND you're compatible with enough to go through some serious shit and remain together. If life were a science experiment, I would say to manufacture a few disasters in your life and see if that person sticks around with you. But obviously, that's not very feasible! In the meantime, be sure you're thinking of their struggles and they're thinking of your struggles, and hopefully you will each have enough empathy for each other to share the load of what it takes to live together happily.
Everything Else
Find a hobby or something that you want to constantly return to where you aren't simply a consumer, but can give back in some way. Make purposefully challenging decisions that force you to learn something new (Yes, I think we can do this home improvement project ourselves instead of hiring someone...). Which leads me to: Learn a trade independent of your career. You'll need to learn how to do mundane tasks like drywall, plumbing, gardening, but there's an art to all of them, and most of these are worth learning, not only because of the applied skill, but because learning how to do something well is enjoyable itself. I was way too old when I realized that even pulling weeds up was fun when it was for a garden I wanted to cultivate.