How about targeting first starters? As revealed in my posts of the past...

Taking my Maiden System involving 2&3yo first starters by certain sires and looking at female line and cross etc. All horses only backed for a maximum of 4 runs or the first win, whichever comes first. A tidy sum can be made using a bank and betting 5% on each. All horses racing in New Zealand.

Horse Warrior 1st start $1.60 (2nd), 2nd start $1.80 $1.00
Kash For Lass 1st start Unplaced, 2nd start $34.10 $8.10
King's Rock 1st start $4.70 $1.90
Lotto 1st start $2.10 (3rd), 2nd start unplaced, 3rd start $2.10 (3rd), 4th start unplaced
Ringo 1st start $3.60 (2nd), 2nd start $2.40 $1.40
Ruthless Lady 1st start $3.00 (2nd), 2nd start $1.70 (3rd), 3rd start $1.90 $1.30
Satay 1st start unplaced, 2nd start $9.10 (3rd), 3rd start $2.40 (2nd), 4th start $2.70 $1.30
Whistling Dixie 1st start $3.30 (2nd), 2nd start $8.90 $2.90
Postnthyme 1st start $1.70 (3rd). 2nd start $1.90 (2nd), 3rd start $1.70 $1.10
Dillinger 1st 3 starts unplaced, 4th start $11.10 $3.10
Saint Kitt 1st 3 starts unplaced, 4th start $9.40 (2nd)
Cookie Monster 1st start $3.90 $1.50
Lamason 1st start $3.40 $1.60
Lincoln Sun only one start unplaced
Keepaflight 3 starts unplaced
Glamazon 1st start unplaced
Shuthegate 1st start unplaced, 2nd start $3.90 (3rd)

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“First they ignore you, then they laugh at you, then they fight you, then you win.”