England needs to raise the bar because after Colombia suffered the penalty they started playing football and England was in trouble until the second half of the extra time which I believe was because colombian players couldn’t run anymore.
Colombia did very little for a long while after conceding .. for most of the second half they set about gaining a number of yellow cards and generally acting petulantly. England in fact had a couple of promising breaks but they were wasted. I'd say Colombia had maybe a 10 minute period at the end where they looked somewhat dangerous, but nothing particularly worrying up until the set piece, except perhaps 1-2 England errors.
I think their dominance of the first half of Extra Time can mainly be put down to the boost that scoring the late goal gave them. That would have given their players incredible belief that they could go on to win it, and on the flip side would have really deflated the English players, who you could see were making some really silly unforced errors during that period. Then England seemed to gather themselves a bit for the second half of ET and managed to take control again.
I agree England need to improve on their performance though. It wasn't terrible against Colombia (They are a solid side, with two very good central defenders and a few bright attacking players) but at times it was ponderous and badly lacking in creativity, which to be honest is to be expected with our midfield options. I think Southgate made an error bringing on Dier, and should also have brought in Rashford earlier than he did. He will learn from this though, he (understandably) tried to be cautious and bring in a defensive minded player, but all this did was unnecessarily force England deeper against a side which really offered little threat.
Honestly though, Southgate has a really hard job. We have some very good forward players, some of the best in the Premier League, but a complete void in midfield. Our central defenders are always going to have a mistake in them because none are top class. Our attacking midfielders (Alli, Lingard) aren't particularly creative and are more about excellent movement and grabbing goals themselves. I think it's been posted before but this side badly needs an Eriksen, sadly this is a kind of player we rarely produce. I do think we'll see more chances from open play if we get to play a side like Croatia who will open up more, but against teams that sit deep we're never going to see much creativity as we simply don't have the personnel for it. Heck, even Spain with their embarrassment of technical quality struggled to open up sides playing like Colombia did.