Combat arms units (armour, artillery, engineers and infantry) suffer from the reality that when the Government decides the army will be busy, then they are busy, sometimes in a continual cycle of getting ready to go, on operations, and in the return cycle afterwards and when the war ends, so does that busy cycle. As we saw during the Afghanistan combat mission, that brought a lot of troops through the door that ate up that busy cycle. What few wanted to accept even as they built their careers during that decade plus period, is that when there is not a war to go to, the life of a combat arms soldiers is not the same. It might be busy, but will not be exciting in the same way. vehicles and equipment, even when not seeing operational service, require continuous training and maintenance. Vehicle storage and maintenance garages need to be swept, and sometimes you even have to help hand out pencils to kids on display. There are still training course, but maybe less chance to practice those skills. there are exercises and domestic deployments, but the work can be repetitive and mundane. The big point people gloss over, is the importance of maintaining those basic skills, sometimes for decades between wars, so that we have a solid base to build the next expeditionary force on. That is the real work on an army in peacetime, and it has to be done within allowed budget and often while replacing equipment that had rusted out.
Being a soldier in peacetime can be a challenge, to stay the course and put in years or decades of dedicated service with no new ribbons appearing on one's chest every few years. But it is necessary service and rewarding for those who understand their role.
If your big worry is about being busy enough, look at being a supply tech or a maintainer of some sort. Kit needs to be accounted for and issued, equipment needs to be maintained in peacetime just as much as in war.
Step away from the glamorous descriptions trying to sell you trades. It's advertising, the reality is always less exciting.
Throwing grenades is really cool, and when you realize you might only get to do it once a year in the infantry .... maybe not so much.