していても

even if doing; even while continuing to do

→ 為る
phrase Rare #26,168
even if doing; even while continuing to do Formed from している plus ても. It expresses a concession involving an ongoing action or state. The exact English translation depends on the verb and context.
JA: 好きな勉強だけしていても、実力はつきませんよ。
EN: Even if you only study what you like, you won’t develop real ability.

好きな勉強だけしていても実力つきません

You won’t improve just by studying only the things you like.

何も言う事がない時は沈黙していても恥ずかしくない

When you have nothing to say, there’s no shame in staying silent.

その村人たちはどんなに貧乏していても他人には親切だった

No matter how poor they were, the villagers were kind to others.

たとえあなたが立腹していたしていてもあんな事を言うべきではなかった

Even if you were angry, you shouldn't have said something like that.

自覚していても不誠実人間だと言われる応える

Even though I’m aware of it, being told I’m a dishonest person still hurts.

もっとゆっくりしていてもいいのに

You could take it slower, you know.

— 魔女の宅急便 (1989)