Here’s an article from a few years ago titled, How Baalei Teshuvah Can Contribute to the Chareidi World, by HaRav Yehuda Greenwald.
Here are some excerpts:
The truth is that every intelligent avreich who was ever closely acquainted with a baal teshuvah, someone not embarrassed by being a baal teshuvah and who does not try to copy others, will find to his surprise that the baal teshuvah is a gold mine of good qualities and possesses spectacular tools for avodas Hashem. The big surprise is that those baalei teshuvah who do not hide their lack of knowledge and their confusion, and dare to ask all the questions that bother them and even “demand” help from avreichim in their Torah studies, are immeasurably respected.
After building up this relationship, a new, mutual relationship begins, with each side contributing its part and strengthening the other.
You ask what baalei teshuvah can contribute to the chareidi world?
Baalei teshuvah bring valuable assets with them to the chareidi world, which is a blessing in itself. We do not need to do fantastic things. Strengthening ourselves in avodas Hashem, in studying Torah, in tefillah and fulfilling mitzvos, if we do it with absolute seriousness and genuine enthusiasm without any compromises, will make a dynamic impression on the public and strengthen Klal Yisroel.
A devoted and eminent rav, one of those who work with baalei teshuvah, said that he attends the seminars and deals with baalei teshuvah in order to strengthen himself.
Further down in the article, the author relates:
This is one of the significant duties of baalei teshuvah. As people say, “A guest sees all one’s faults.” We have come to a new world and find out that not all that people do or are accustomed to do befits a person who observes Torah and mitzvos. Since we are new to the chareidi world we cannot tolerate such impropriety and complain about it. This vital duty of being a Chushim ben Dan is ours.
The Torah values criticism, and a parsha in the Torah tells us about Yisro’s criticism. Moshe’s father-in-law met Klal Yisroel in the desert. We were a nation for whom miracles were performed and who had received the Torah, a generation of spiritual giants, the Generation of the Desert, the Generation of Knowledge.
The author concludes:
We have cited some minor anecdotes where the criticism and initiation of baalei teshuvah were a blessing. The truth is that we encounter daily small incidents in which we, the Chushim ben Dan, who are not used to certain conditions and ways of behavior, jump like someone bitten by a snake, while others who have become accustomed do not see anything seriously wrong. This is our opportunity to be helpful to Klal Yisroel.
Without much fanfare, modestly, without verbal violence or show of force, we should point out what should not be done, and we should repair breaches in Yiddishkeit, initiate projects, shiurim or shmuessim, and utilize the freshness and vitality that characterize baalei teshuvah, so we can add to and benefit Klal Yisroel.