remain unchanged
verb
p: remained
plateau
p: plateaued
hover
verb: to be or remain in a specified state or condition
p: hovered
level off
verb: to stop going up or down and continue at the same height
p: levelled
flatten out
verb
p: flattened out
reach a plateau
plateau at
stagnate
verb: to stop developing or making progress
p: stagnated
stabilize
verb: plateaued = remained (relatively) steady = remained (relatively) stable = leveled off = leveled out
p: stabilized