When trying to convey that something is happening more often than before, there are plenty of synonyms to choose from that can add variety to your writing. Some alternatives to "more frequently" include "with greater frequency", "more often than not", "on a regular basis", "at an increased rate", "with increasing frequency", "at a higher frequency", "more and more often", "at a faster pace", and "with greater regularity". Each of these phrases can add emphasis to the frequency of occurrence and can help to paint a more descriptive picture of what is happening. So, next time you find yourself overusing "more frequently", try out one of these other options.