"mi yo" ending

hello
i would like to know the ending in mi you
what is that?
i found it in this sentence :
自由に書いてみよう

thanks for your help

自由に書いてみよう
Let's try writing freely/try to let your imagination run free (in your writing).

(1) "te-form of a verb", in this case "kaite" from the verb "kaku/kakimasu" (to write) is combined with different words to express different things. "...te + miru" means to "try doing (somthing). So "kaite miru" means to "try writing."

(2) "...you" after the stem of the verb (in this case) "mi" from "miru" means "let's (do something)." For example, you might say "ikou" (let's go) from the verb "iku/ikimasu," or "tabeyou" (let's eat) from the verb "taberu/tabemasu."

In the above sentence you saw, the two different expressions of "try (doing something) and "let's...) got combined,
"kaite + mi + you," thus, "let's try writing."

-miyou=inducement, invitation, slight order.

EX; tamesite miyou.(yatte miyou)=Let's try it.( let's do it)

AK and Miyoko thanks to you
i could understand , arigatou