Tackle credit card and student loan debt
If you're still carrying credit card balances or student loans, eliminating them should be a top priority. Start with credit cards, which typically carry the highest interest rates of any debt. Then move to student loans, focusing first on private loans since they usually have higher rates than federal loans.
Invest money as you eliminate debt
As each debt is paid off, redirect what you were paying toward it into retirement investing rather than letting it disappear into discretionary spending. If you have multiple debts, the debt avalanche method works well: focus your extra payments on the highest-interest debt first while paying minimums on everything else. Once that's gone, roll those payments toward the next-highest rate debt.
Don't delay investing while paying down debt. Even if you started late, your money still has 30 or more years to grow from here.
Contribute aggressively to your 401(k)
What was adequate in your 20s rarely cuts it at 35. A target of 15% to 20% of your pre-tax income is a solid goal, though you may need to push higher if you're just getting started.
First, contribute enough to capture your full employer 401(k) match. That's the closest thing to a guaranteed return in investing.
After that, aim to max out a Roth IRA. If you have money left over beyond that, put it back into your 401(k). If you're self-employed, explore your options for solo 401(k)s and other self-employed retirement plans.
Not sure where to open a Roth IRA? Motley Fool Money has a guide to the best IRA accounts if you want a shortcut to finding the right one.
Ignore what other people are doing
In your mid-30s, it's easy to watch peers upgrading their homes, cars, and vacations and feel like you're falling behind. Social media makes this worse by presenting everyone else's highlights as their everyday reality.
Focus on your own goals, even if that means living closer to the budget of a 25-year-old than a 35-year-old. Living a lifestyle you can genuinely afford, rather than one that looks impressive, is the single most powerful thing you can do to build lasting wealth.