<p>I recently got an Ender 3 Pro for my birthday, and I am having some problems with elephant's foot (as the title suggests). I have tried several fixes; lowering the print speed, changing the print micron size (quality) in my slicer, and I have also tried the masking tape trick (it definitely does not work). I want to know if there are any other ways to prevent elephant's foot on my prints. I first noticed it on a game-cartridge holder. It was four and a half millimeters thick on the bottom. I think that it could be an issue with the design, but I'm not entirely sure. I can send the specs for the design if you want to look at them.</p>

Elephant foot on an FDM machine is typically caused by more material (filament) being present in that layer than it has space for.
The most common cause of this is your z-zero is too low, so for the first layer the nozzle starts too close to the bed and the filament gets "squeezed" laterally. You can try adjusting your z-zero or z-stop to allow slightly more space, fractions of a millimeter, between the nozzle and bed for your first layer.
If you don't want to try that, or you'd like to try a different solution first, consider printing the part on a raft so that it starts raised up off the bed and away from that elephant-footing.
There are a handful of other potential causes and factors which can make this better or worse, things like having a large footprint on the bed, but I hope the above is a quick and easy place to start.