It's been pretty much the same blueprint at each level: using the attendance bonus from promotion to afford a large increase in weekly player salaries at each step up the ladder.
Since the economy hit its baseline a couple seasons ago, it's become very easy to pick up medium and high salary older players for cheap. So without high initial auction prices acting as a barrier to getting better quickly, the real limit to how much talent a team can hold is now based mostly on how much weekly salary can they afford. And for most of the first season after promotion, (if you have a decent arena) what you can afford is probably higher than most of your league competition.
So, if you just keep adding low bid, higher salary players after each promotion, you can potentially ride the wave of:
-->attendance bonus-->allows temporary 1 season long big increase in team salary-->strong team with a good chance at promotion--> rinse and repeat
Which is not to take anything away from L&P and how well he has managed the weekly obstacles of a season long grind, how he has chosen which high salary guys to add wisely, etc. But this isn't a strategy that could really work more than a couple seasons ago, because it was not really possible back then to add a 50k/week or 100k/week SG for a bid of only 300k.