For the widow of Zarephath, the Lord made less than a handful of flour and a few drops of oil last for a year. How can you get the Lord to do the same miracle in your life?
First, you must need a multiplication of something (i.e. food, money, time, or energy). You should be responsible but not try to control everything in your life. Then the Lord will put you in situations where you need a multiplication-miracle.
Second, give from your want, all that you have to live on (Mk 12:44). The miracle of total giving always precedes the miracle of multiplication.
Third, believe that Jesus will do this miracle for you. In our secular society, many Christians don't believe that Jesus still does the multiplication-miracle. Read God's word and ask for deeper faith.
If you need a multiplication, give your all, believe in the Lord, and you will receive the miracle of multiplication. The Lord works this miracle most often in the context of Mass.