Not cherry picking. Your assertion is ok as long as it’s a new high during a secular bull market. More importantly, just stop trying to time the market and spread out your investing over a stretch of time. Of everyone invested like they do in their 401k, they’d be far more successfully. Drop a little in every couple weeks and rebalance quarterly/annually and you’ll win.
And depending on how one chooses you measure time periods one can make the case we've been in a secular bull market for a hundred years now as it's only gone up over time. But I'll agree timing don't work .