How to make Rek'sai stronger in non-competitive teams, without voicechat
Show Tremor Sense's visual cue on the minimap, so it's accessible to any good player who watches the minimap (not my case, but you're supposed to balance for higher than my MMR so that doesn't matter) and not just those to whom Rek'sai can quickly call the presence of an enemy in voicechat.