There were actually several random issues that poked me towards that direction.
Firstly, I'm interested in voices as part of character designs: often when I create my own character, I want to know what they sound like, and often I browse voice actors to think about it. At some point, I started to think about what what if I could voice some of my own characters...
Secondly, I have watched some awesome fandubs and parodies in Youtube, and I was amazed to hear how non-professional people were able to create so much fun stuff. Especially I was amazed with encountering fandubs where the very same actor acted several characters and still was easily able to keep the voices notably different.
Thirdly, and much to annoy my family members and acquaintances, I simply like to goof around with my voice. That made the idea of voice acting to sound simply fun - if I could voice act well, it would be an amazing platform to create comedy. I'm a bit clown by my personality, and I already love drawing joke drawings.
And finally, I'm undergoing speech therapy right now. (My problem is that I'm unable to slow down my speech in normal conversation, even if I can slow down when acting or giving representations. Weird, I know, but that's really the problem.) I mentioned my speech therapist that I'm interested in voice acting and I like to goof around with my voice (I had already made some private voice acting testing). She warmly encouraged me to continue playing with my voice and doing voice acting - in her opinion, it's excellent training for normal speech, too, plus it would make me know better my speech organs and thus ease the control of my speech in normal situations, too.