Hard work.
Or marry someone rich, and maybe get rid of them if necessary.
That is easy to say but in reality sometimes you cannot just marry a rich person just to make you rich, you must have a look of a superstar to let someone marry you. Rich do protect their money so they will not just marry anyone who will just take their money in the end.
Haha I think that is a good idea that you are going to marry someone rich. And you are lucky enough if you are able to be married with a rich wife/husband.
I don't know if his/her family is going to accept you that way easily. So, good luck!