There are two crucial elements you should incorporate into your username:

1. Easy to spell
2. Simple and memorable

You can start with your name.

For ex:

@Arya

@Arya

If you’re name is taken then you can go with something like these:

• ItsArya
• TheArya
• AryaWrites

I did something similar.

My name is Arya and my niche is in writing.

So, I changed my username from @nailingthreads to @ItsAryaWrites

You can do the same for you.

If you’re in the Ecom niche then you can add your niche to your username too.