A fulcrum is the pivot point or support upon which a lever turns, balances, or rests, essential for multiplying force in mechanical systems. Figuratively, it represents a central point or hinge around which other elements revolve or are balanced.
If Tigray allies with Amhara , Oromos will be out competed and the vise versa is true. The best strategy for Tigray always to be the pivot by staying neutral and independent with tactical alliance, as required, with either Amhara or Oromos to maintain its pivotal position.