Benjamin Franklin famously said, "beware of little expenses - a small leak will sink a great ship." There are two ways to approach that quote. The first is to lessen current expenses. It involves stopping the leaks in your financial life. This can include small things like unused subscriptions, all the way to serious savings from unneeded premiums or high rates on debt. A good fiduciary will always have a plan to help you save money.  This is how most people understand and interpret Franklin's famous quote. It's also nowhere near as potentially beneficial to your net worth as the second approach.
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The second approach is to build a boat that doesn't leak. Keep more of your money through rigorous business planning, protection planning, and tax strategy. A good fiduciary will be an expert in keeping your strategy compliant with constantly evolving law, as well as adapting investment strategies to your particular goals and lifestyle.