Certainly tip projection can be increased but how much will depend on your needs and goals rather than an absolute number of mm. Pictures are necessary to answer your question.
It is possible to greatly increase a nose's projection with various surgical techniques (via a combination of cartilage grafts and precise suturing). One limitation may be your nasal skin. If it is too tight, then it will put a "ceiling" on the amount the projection your surgeon will be able to obtain. This can only be evaluated during a nasal/rhinoplasty physical examination.
Thanks for your question. You can project a tip quite a bit, depending on what the patient needs. To project a tip, you can either use suture techniques or cartilage graft techniques which can sometimes be done via a closed rhinoplasty approach. To keep your nose from looking too pointy, you'd probably need a cartilage graft- the technique is called a tip graft or a shield graft. You probably have thick skin though, if you're half middle eastern, so don't be surprise if it takes months to over a year to see any final result in the tip after revision surgery. Good luck!
Without a full set of facial photographs, it is very difficult to determine what can and cannot be accomplished with a difficult revision rhinoplasty procedure. Cartilage grafting techniques are usually performed to give added projection to the nose.
The issue is what do you look like now and what can be done to improve the situations.There are multiple variables that will determine the answer to your question.