R' Nosson Wachtfogel Zatzal would always encourage “doing something”, like Zikkui HaRabbim. A Yid should always be concerned to move ahead. I heard that R' Ahron Kotler Zatzal was concerned that he could have become even greater.
We can suggest that the reason why a Yid should be concerned mainly with being M’kadesh Shem Shamayim more and more, is because this was Moshe’s Chisaron. And not wearing Tefilin is also a lack of Kiddush Hashem, especially according to the Ben Ish Chai, who explains that “not wearing Tefilin” is referring to the: יל ְּפ ְּת ְּיןְּשְֶּלְּר ְֹּאש Tefilin Shel Rosh, about which it says: ו ר אוְּּ כ לְּ ע מ יְְּּ ה א רֶ ץְּ כ יְּ ש םְּ ה'ְּ נ ק ר אְּ ע לֶ יךְָּ ו י ר אוְּּ מ מֶ ך ְְְּּּתבאְּ כחְּ י the nations of the world will see that the name of Hashem is upon you, and they will fear you.
