If you are seeking signs then you only have to open your Bible. There are hundreds of genuine miracles recorded there that give testimony to God's power and give a boost to your faith. And God's infallible word is far more reliable than any dubious hearsay account that is presented today. The miracles in scripture are more than sufficient to cast away any doubts....
John 20:30 "Therefore many other signs Jesus also performed in the presence of the disciples, which are not written in this book; but these have been written so that you may believe that Jesus is the Christ, the Son of God; and that believing you may have life in His name."
If we are seeking more signs beyond that which have already been given then we rejecting the above scripture and we become like the Pharisees. They were given sufficient signs and wonders to demonstrate who Jesus really was, but still they wanted more before they would believe. Their greed for miracles labelled them as being wicked and adulterous by Jesus.
Better than seeking after new miracles is taking God at His Word. Simple faith is more pleasing to God than a reliance on sensational stories, real or imagined. Jesus said to Thomas,
"Because you have seen me, you have believed; blessed are those who have not seen and yet have believed" (John 20:29).