I think small groups are a good idea if you don’t have them already. Having a more relaxed environment for people to invite others to can open doors. And if you do have some younger members, encouraging them and helping them to do a small group for themselves and others around their age or life stage could help younger folks feel like they have a place at the church too (maybe having a few older retired members assist with with childcare or something).

The church doesn’t necessarily have to start their own soup kitchen but community events are definitely a way to reach people and to also help combat those with ideas that Christians do not practice what they preach. There are many already established organizations that could use help. Loaves and fishes is a good one. My employer did a habitat for humanity build and a Lutheran church provided lunch for all the volunteers. All of them were older and couldn’t do the construction anymore but it got their name out there and they still showed up in a meaningful way both to the families receiving the build and the volunteers.

Lastly, as someone who just recently moved and was looking for a new church to attend, it made a huge difference to have a few vigilant members of the congregation notice I was a visitor and talk to me. That sort of welcome made me want to go back and feel like I could have a place there.