Is it possible to change from 3rd person point of view to 1st person?

Hmm...I've never seen that done. You might get away with it if your writing's good enough. It would also work better if it was in third person from one character's POV and then in the second was in first person from a different character's POV.

You could also rewrite your current novel in first person. Just keep in mind that some details might need to be changed. For example, "Her flowing golden hair rested on her dainty shoulders, framing her beautiful face" is a very different from "My flowing golden hair rested on my dainty shoulders, framing my beautiful face". See the difference? In the first, it's simply good descriptons, in the second, the character comes off snobby and stuck-up.

Good luck!

It isn't going to flow very well as a series if you change the POV. As you have not yet finished the first book, why not convert it to first person and then you can have each of the succeeding books follow the same voice.

i think of it is surely a danger by using fact the 1st individual significant character will possibly no longer inevitably be in any respect places in any respect circumstances. And it gets form of obscure while yet another character ought to describe an significant journey that befell. So if incase the story has many characters and plot traces and it consists of first individual POV, i think of its very plenty a danger to change to one/3.

yep, just explain it somehow in the first book. Or put some events from the first book into the second book and have the main character explain them in their own way