Is my nose tip still swollen 1.5 yrs after open rhinoplasty? What can I do to achieve a smaller tip?

Specifically addressing the width of the tip from the frontal view, how much more can be done depends on exactly the current size/shape/position of the cartilages. More detailed photos, especially some different three-quarter angles, could probably give good information about the tip cartilages.
There is a clue: on your profile, that nice "scoop" is there because the tip is strongly projecting beyond the line of the bridge. That strong projection suggests that the tip cartilages are strong, giving a conclusion that they perhaps could be modified to be less wide. From the front, it seems that your bridge might benefit from being narrowed if the tip is narrowed as well, to keep things in balance. My two cents.
Remember that rhinoplasty is an exquisitely difficult operation to get right, and you should only have surgery if you are able to make yourself very confident in your surgeon's skills. The changes that your nose needs require advanced techniques, and skill that most plastic surgeons don't possess with expertise. For most noses, it's much better to not have surgery than to have inexpertly-performed surgery. Read my essay on how to stay out of trouble while selecting a rhinoplasty surgeon. And for those who have had previous surgery, it also discusses how to tell whether your first surgeon should be performing your revision. And it also discusses how to take photos that are best for online evaluations.

I agree your tip is too prominent. It would help to know if you had a cartilage graft in your tip which could explain why it apoears too large or hard. Simple to remove the cartilage graft if you wanted