Youth, you have to invest in youth to survive.
The clubs in and around our league that have youth set ups have 2,3,4 and even 5 sat teams. And have xi players out in each side 99% of the time(the team with 5 teams did concede the last game of the season, but that's the only 1!)
Teams with no youth have struggled, 2nd teams turning up with 9 and 10 players week in week out, some occasions both first and seconds only fielding with 9.
There is off course the clubs with money, there a different matter!