Yes Ideally any blockage above 75% should be cleaned and needs a stent.....
And yes there is always a chance of blockage happening again because of many other factors which cause the blockage in the first place including in active Lifestyle, overweight smoking,
diabetes, hypertension, family history.
Changing lifestyle and taking medication will decrease your chances having for the blockages.
You can know more about it and you plasty and life after angioplasty in my video on YouTube explain in simple language.
https://youtu.be/wtWYXTZMdXw