Buy and holders, what’s your system?

Specifically for buy and hold investors. What’s your system? I realize it’s a bit of a false question but some answers could be:

50/50 TQQQ/QLD to maintain 2.5x leverage forever

Or

Only new contributions when down 10%

Or

Only 100% QLD

I don’t like 200SMA and to be honest, 9sig feels like too much work (plus the max drawdown of -99%)

Anyone have a plan that works for them?