I don't think it is up to us to convince people: just share the truth with as many people as possible. it's like sowing seeds, some will take, others will wither. It is only draining if you are emotionally involved in the people changing. Many years ago I shared with a friend about fiat currency being worthless and explained about gold and silver, she didn't believe me at the time but recently told me I had been right. Plant the seeds, my friend, then let it go. Truth has a way of coming out in the end. Your contribution in holding the light of truth is very valuable in these dark times.