を高める

to raise; to increase; to improve

→ を
phrase Rare #39,024
to raise; to increase; to improve Used for raising or improving something such as value, reputation, productivity, or mood. を marks what is being raised.
JA: よい庭がついていれば家の価値を高めるでしょう。
EN: A good garden would increase the value of the house.

それが自分を高めるコツです。

That’s the key to self-improvement.

よい庭がついていれば家の価値を高めるでしょう。

Having a nice garden would add value to the house.