push one's luck

push your luck (to try too hard to get a particular result and risk losing what you have achieved.) — искушать судьбу; дразнить судьбу; (ср.: от добра добра не ищут)

Example 1: Don't push your luck — they've agreed to pay your travel expenses, I don't think it would be wise to ask for more money.{usually negative} (CIDI)

also
[напрашиваться на неприятности]
[tempt fate]