A Reason? An Excuse? A Reason? An Excuse?

Your original is not wrong, but this sounds more natural.

CA couples of months ago I started my YouTube channel. A couple of months ago I started my YouTube channel.

Not surprisingly, no body was interested and I had zero viewers. Not surprisingly, nobody was interested and I had zero viewers.

There are too many reasons to explain my failure. There are too many reasons to explain my failure.

MIt's mostly is all because of me! It's mostly all because of me!

But today I fiound out a good cause canreason to explain my fail more reasonablyure. But today I found out a good reason to explain my failure.

Shorter sentences are frequently better.

(It was a) Wrong choice of software. (It was a) Wrong choice of software.

Not incorrect, but with the part in the (), and a lower case w, it looks better.

I didn’t even use any video editing software to make my video! I didn’t even use any video editing software to make my video!

So, now I'm going to learn how to edit a nice-looking video. So, now I'm going to learn how to edit a nice-looking video.

It's all about “packaging”! It's all about “packaging”!