The "parable" of Jesus cursing the fig tree tells us that we should do as II Timothy 4:2 tells us to: "Preach the word; be diligent IN SEASON, and OUT OF SEASON; reprove, rebuke, exhort with all long-suffering and doctrine."
Associating II Timothy 4:2 with Mark 11:12-14; 20-22 is an example of the Holy Spirit "rightly dividing the Word" (II Timothy 2:15)! In v13 of Mark, Chapter 11, "...for the time of figs was not yet." It was "out of season" for the fig tree's bearing of fruit and Jesus gave us an example that we should do as II Timothy 4:2 says "...be diligent "IN SEASON, and OUT OF SEASON..."
If "unproductive" (do not proclaim the Gospel of Christ) or have not "rightly divided His Word," to do as Galatians 1:6-9 says, "We will be accursed" as the fig tree was!