Most assuredly, I say to you, We speak what We know and testify what We have seen, and you do not receive Our witness. (John 3:11 NKJV)
On one hand we know some things and on the other we see some things. The knowing comes from investigating, for ourselves, the claims of Jesus. The seeing comes from personal experience. Both are available to us.
If you’ve never seen God move, then start investigating Him and His people. Collect evidence of who He is.
If you’ve seen the signs of God personally, share with others. Tell them your story.
So, 1) what has your investigation of Jesus led you to know today? 2) what has your experience been with a miracle acting God?