Trump's actions are often just attempts to satisfy his ego through positive media and supporter reaction. The issue with Iran if you recall is that his main supporter at the time, Fox news had a mixed reaction, with Tucker Carlson being extremely critical, something obviously like hell freezing over.

You can go and check back on the entire Carlson arc back then but here for example Fox's Tucker Carlson slammed conservatives for pushing Trump to go to war: 'About 20 minutes ago we were denouncing these very people as the deep state'

His base didn't particularly like that idea, he was MAGA and isolationist and yet he was about to put the US into a war with a nobody-country that wasn't a threat at the time. It wasn't Bush post 9/11 even though he thought that was an easy win.

As soon as the base consolidated into the neutral/negative camp which he didn't expect, he backed off. Right now his base is very much positive towards ending "Biden's war" so he is very likely to do it.

But his base also doesn't like China so that will be the next target.