10 years is a long time for the newer/cheaper dehumidifiers (those in the ~$200 price range that have been sold for the past 10+ years). In my experience it's common for the cheap compressors to die in 3-5 years with moderate use.
If the dehumidifier indicates a RH of 33%, it is not going to be able to extract much more water from the air. In this case, you need to ask yourself why the RH is only 33% -- is it due to a faulty hygrometer, or has the dehumidifier actually removed so much moisture from the air that the ambient RH really is 33%, or is the local RH already close to 33% leaving little for the unit to do?
What does weather.com/google weather/etc. say the mid-day RH is compared to the 33% your dehumidifier indicates? Bear in mind that RH decreases as temperature increases; so if the outdoor RH is 46% @65 deg, a temperature of 75 deg next to your dehumidifier will result in a RH of 33% (assuming same dew point). Is your house air conditioned such that the indoor RH is already much lower than the outdoor RH?
I'd probably pick up a hygrometer or two to sanity check the dehumidifier's reading. You can get a 4- or 6-pack of digital hygrometers on Amazon for $9-$13. They work well and are useful to have.