Believers: what do you do when the last good thing that happened for you, that you KNEW was Him, happened 15+ years ago? [Spirituality & Religion]

I would give thanks.

God is good all of the time.
When I wake up I look for the positive as much as possible.
I thank him for the rain, the sunshine, my puppies, my son, my husband.
Look around you...the flowers, the trees, oceans, lakes, etc....there is so much in this world to be thankful for.
Life is hard and it gets so messy. With God there is hope.

I would just say that we are all busy with work and our lives, and we can't always have a "smack you in the face, hey this is God" moment because we aren't focusing on Him and Him alone. The more time you spend focusing on Him and praying, the more you realize that He is actually there every second.

You keep doing good things for Him and see what happens.

I'd say you are just not paying close enough attention to what He is doing for you every day.

Lamentations 3:22-23 King James Version (KJV)
22 It is of the Lord's mercies that we are not consumed, because his compassions fail not.

23 They are new every morning: great is thy faithfulness

If that was the case, I'd still praise Him.