There are four ELCA congregations in Jamestown, ND. According to my "Free Lutheran" pastor friend (who was an ELCA pastor in Jamestown back in the 1990s), in the 1990s two of the four ELCA congregations in Jamestown had 500+ people in church every week. Now, in 2022, those same two ELCA congregations have 60 and 90 in church every week, respectively (and the other two have far LESS!). Even though my LCMS congregation is doing better and has more in attendance than any of the four ELCA congregations (even though our actual baptized membership is far less than them) - our weekly attendance has also declined. We were up to 220 per week back in 2007 and now we average 125 per week. We were around 170 per week pre-covid, and so we are still working on recovering from that. Having said that, all the other non-Lutheran Christians denominations in Jamestown are facing the same severe decline in church attendance - and so it's not unique to Lutherans.
So, how do we deal with this? First, I try to look at this current trend from a historical point of view. Simply put, if you study Scripture we see a cycle of one generation failing to pass on the faith with the result that the next generations stray from the Lord until the Lord intervenes and brings people back - and then the cycle resumes.
So how do we attract youth and keep the youth we already have? We delude ourselves if we think the answer is entertaining the youth, making church fun or relevant. The answer to attracting and keeping youth - and people of ALL ages, for that matter - has never changed, and that is preaching repentance and the forgiveness of sins and living that out in our families.
Why did youth join the Christian church in the 1st century when the result would be turning away from sins they enjoyed and persecution on top of that? They joined because the Holy Spirit gave them new hearts of repentance and faith in Christ through the preaching of repentance and forgiveness of sins. There is no guarantee of how people are going to respond to God's Word in any given culture or time - but we continue to speak the Truth in love nevertheless and let God handle the numbers. Anything else we do to attempt to manipulate the situation won't help or will not give the results that God wants.
As God's OT people were preparing to enter the promised land, Joshua said: "As for me and my house, we will serve the Lord!" Each Christian family must make this their priority along with proclaiming repentance and forgiveness of sins in our spiritually dead culture. This is the ONLY way people will begin to hunger and thirst for the gifts of God's Divine Service once again.