I don't know what you are talking about. Nebraska has never been a big recruiter in Texas or Oklahoma. From 1999 to 2017, Nebraska has averaged ~3.5 recruits from Texas per year and they have had a total of 4 recruits from Oklahoma in those 19 recruiting classes. They have averaged ~3.2 recruits per year from California.
Nebraska still recruits nationally. From 2010 to 2017, Nebraska has signed 4* athletes from 18 states: Arizona, California, Colorado, Delaware, Georgia, Illinois, Iowa, Kansas, Maryland, Missouri, Nebraska, Nevada, Ohio, Oklahoma, Texas, Utah, and Wisconsin.
Finally, if you compare the recruiting classes in the Big 10 West since Nebraska has joined the conference, their recruiting class was #1 in six out of 7 years and they were #2 in the other year. Nebraska should be dominating the Big 10 West and play in the conference championship game 2 out of 3 years.