Whether you should establish an LLC or not is more of a legal question. From a tax standpoint, forming an LLC will have very little impact on your "business return", because an LLC is considered a disregarded entity for tax purposes. Unless you have previously been filing a partnership return (which, since your business is a one-man show, you can't file a partnership return), you should still be filing a Schedule C to report the business activity. You can claim the expenses for forming the LLC in 2019 if you pay them, and you may have insurance or other similar expenses, but very little tax impact this year.
One option forming an LLC may provide you is the ability to elect that the business be taxed as an S Corporation. If this is what you are thinking of doing by establishing your LLC, you would do well to research your state's requirements and perhaps speak with an attorney to ensure that this is the best option for you. If you apply to make the election, it is more likely than not that the IRS would only allow the election for tax year 2020 and forward, and not allow you to claim S Corp status in 2019. Again, there are legal issues we can't comment on, but this is an overview from a tax side. For any legal advice related to your question, you would need to speak with an attorney.
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