Hi Jody
If it were me I would take a nice long, long, leisurely look around. Let your mind relax. Take 360 degree pictures from the heart rock. Eventually, if there is more, you may see it and that acts as a confirmation that this is a marker.
A pointer or animal of sort, an odd shaped rock. Anything that looks - different. Curved rocks where most are straight, straight shapes or edges that seem a little unusual given what else is around,
Looks like it is wooded, so you might want to take a stroll the direction the left hand bump is pointing and the directions the two upper lobes are pointing. At least 100 feet in each direction.
I don't see what other folks are seeing but I did notice the heart rocks seems to fit rather well with that rock next to it.
Possibly it looks chipped on some of the edges, like it was shaped. Don't know enough about stone carving to determine that. But, is that kind of edge unusual around there? Or do many rocks in view have that kind of edge.
Also that smaller scattered white rock on the platform rock it is sitting on and that is close by - is that unusual or is there scattered white rock all over the place? On the site I am exploring, white scatter rock seems to be used to draw attention sometimes. It was hauled from a location I found up to a mile or 2..to be used as eye catchers.
That rock next to it, in the smaller picture reminds me of a burrowing owl. I've seen that kind of owl around - but not determined its meaning yet. of course it could be imagination.
One other note, if you do decide to move something, you should measure directions from it before you move it and take pictures the way you did so you can put it back exactly as you found it.
So, in conclusion, get a cup of coffee ,sit down on that platform rock and take a long look around. I would suspect if there is more to see it would not be too far off, within 60-100 feet, assuming flat terrain. But take the long view too.
Even if the bump is simply pointing at the rock next to it on the ground, there should still be other signs around that would have lead to this bumpy heart, if it is man made, is my opinion.
And well it is just an opinion - not expert advice.
Have fun !
DM
PS: More pics of the rock on the ground the bump is pointing too from all angles please - if it is possbile. That has signs of possible man made shaping too.