What is your ministry goal? To find people whom you can look in the eye and preach and minister to them directly.
You are looking to engage people face to face. That’s why events are a destination in our day because that’s where lots of people are who you can preach and minister to face to face.
Open air preaching is not internet evangelism it is face to face evangelism.
If you want to preach the Gospel in the open air then find places or events in your area where people are and go proclaim the Gospel of Life to them.