Managing portfolio investments over time - signals, intuition, strategies?

Something I've been thinking about for a while: once you've got a portfolio ticking along, monthly contributions going in, tracker funds doing their thing, what do you actually pay attention to beyond that? I'm mostly passive but I find myself occasionally second-guessing allocation when macro stuff shifts. Curious whether people here actively watch things like gilt yields or just ignore it all and rebalance on a schedule, even if thats once a year. Do you have a cash buffer target tied to expen