Am i good candidate for alar reduction? Which implant could help? Septal?

I think your results are very good.  I do think the tip could be lower.  I wouldn't change anything else.  To lower the tip is a big deal, so I don't think I would recommend doing it when your result is so good.

I think your nose is quite good. I would dissuade you from seeking any additional surgery.You have a good nose and the risk for a worse nose, is not zero.

With these limited views I think augmentation of both your radix and bridge would give you a more defined nose. The bridge can be narrowed. It is difficult to comment re the alar reduction without seeing a picture of your nose from below. In these pictures your nose also appears short but this can be evaluated during consultation and examination which is best for a patient like you who has multiple problems after rhinoplasty surgery.