A tactics set generated from your own games not only provides variety in difficulty level, but variety in motifs. For example, many of the problems involved endgame positions.
For the position below. Black seems to be making progress on the queenside. Analyze and evaluate 1…Nb4:
A tougher defense is to get the defending king back in the square of the potentially passed e- and f-pawns, but White should still win: e.g. 40…c3+ 41.bxc3+ Kc5 42. f6 gxf6 43. exf6 Kd6 44. c4! a3 45. c5+ +-