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が高まって

grows

→ が
phrase Rare #45,297
grows が marks what is growing or increasing. The て-form connects to what follows, often showing a sequence or cause.
JA: 期待が高まっている。
EN: Expectations are rising.

健康意識が高まってウォーキングを始めた。

As I became more health-conscious, I started walking.

そのことに対する人々の関心が高まってきている。

People are becoming increasingly interested in it.