Can we use "forte" in following sentence:
I am looking forward to building my forte in Biotechnology.
I am looking forward to building my forte as Biotechnologist.
The definition of forte is "one's strong point", or a particular talent or thing you do very well. Your forte is biotechnology, because you have worked to build your expertise in that field. You don't build or increase your forte. It's like a favorite color; you just have one (or don't have one).
An example of using "forte":
The author's forte is making her characters seem so real that you forget they're fictional.
"Build my forte" isn't ungrammatical exactly, but it just isn't used that way. If we look at an NGram (and follow the links for each phrase to check the actual usage), the most common construction is some form of "to be" - "is my forte", "wasn't my forte", "used to be my forte", etc.