purpleinopp said: In addition to the great input above, you could make this plant a hanging plant, either moved to a hanging pot, where it can't be knocked over, or in the existing pot sitting in a hanging pot. The latter would raise the center of gravity temporarily.
Similarly, sitting the existing pot in a much heavier pot with a similar size opening will give it more ballast if you don't feel like it should change pots right now.
Another technique is to put as big of a rock as will fit on the low side so the weight is more even.
You can also put a few rocks or other heavy objects around the pot to brace it in case it gets bumped.
If you do move it to another pot now or later, you can change the angle of how the plant emerges from the soil by tilting the root ball and then securing it in the new position. Just don't change the level where the plant emerges from the soil, don't remove any soil, or bury parts that are now exposed.
Top heavy plants all fall on their own eventually or get knocked over accidentally by attempt to reach past them, touch them, or water them. I've done all of these and it's always a major bummer, usually damaging the plant and making a mess.