1 Sam 16:7 But the LORD said to Samuel, “Do not look at his appearance or at his physical stature, because I have refused him. For the LORD does not see as man sees; for man looks at the outward appearance, but the LORD looks at the heart.”  NKJV

Do not look to your abilities or lack of them or any cowardice you may have. Our Lord does not need your strength or ability or skilled voice or quick thinking.
Just be willing to be used by Him and trust in the unseen work He is performing as you speak.
Therefore hold closer to the scripture than human wisdom and your past experience.
Free up God to work mightily by only using His word, which may even offend or be insufficient in man’s thinking, so that God will get all the glory and the results will be visibly His.
Live more in the invisible spiritual realm and less in the earthly. Trust in the angels about you and the Spirit to move men’s hearts than in any wisdom and techniques you may have or lack. Work on developing a heart of love to God as David had the puts Him first in all and trusts Him completely in all things.

1 Sam 16:23 And so it was, whenever the spirit from God was upon Saul, that David would take a harp and play it with his hand. Then Saul would become refreshed and well, and the distressing spirit would depart from him.  NKJV

Hmmm…   for years this has meant little to me but today it speaks volumes.

The mere presence of David playing was soothing to Saul. Our presence should be the presence of the Spirit to people. It may not always soothe and may convict. But either way we are the salt, we are the light, to people.  We are Christ to them, we should be effecting other people.  They should sense the presence of the Spirit by our being among them.
Do we radiate Christ as we could?  Are we having an effect on the world and people around us, our governors?

What could we do that we would have more effect on people as David did Saul?

I have to think much more on this strange passage, there is so much more possibility in it.
The Spirit left Saul but he sensed that lost comfort in David. David was good to Saul yet Saul ultimately ignores this and persecutes him, though Daivid was no threat to Saul and would not harm him. It was God who was Saul’s enemy yet he turned it toward David his own servant who showed him kindness.

What does it say about us if the world is kind to us?