Some people are discouraged to try to keep up with voting in the top 3 spots for each month for the grand prizes when they miss a single day on each site. Some people feel like, "what's even the point now that I have no chance?" Well, how about a 4th place?
What I suggest is a lottery for those who did not get the top 3 spots (those in the top 3 will not qualify for this lottery). For every vote you made during the said month, your odds go up by just that in the lottery, thus increasing your chances of winning 4th place without having to keep up with the vigorous competition that feels hopeless at times.