You can certainly have more than one trade or business, but being able to claim trader tax status is not to be taken lightly; this is a highly scrutinized area.
I have attached two links for you to read regarding trader status for tax purposes.
For the first link don't get hung up at the beginning as it discusses "potential" changes in the tax law. This was written pre TCJA, but the premise regarding trader tax status is good material to read and understand.
https://www.forbes.com/sites/greatspeculations/2017/06/07/how-to-become-eligible-for-trader-tax-stat...
The second is IRS Publication 550 and chapter 4 discusses traders.
https://www.irs.gov/pub/irs-pdf/p550.pdf
As you will quickly understand, this status is based on facts and circumstances.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
