How can I get my w2 if my employer does not give it to me?

W-2's come from employers - nowhere else except the Social Security Administration if the employer even filed the W-2 or a wage transcript from the IRS that only contains some of the W-2 information and no state information.

You can get a free "Wage and Income" transcript form the IRS but that is is not a copy of the W-2 and contains no state information.

https://www.irs.gov/individuals/get-transcript

You can get an exact copy of the W-2 from the Social Security Administration for $81 per copy.
https://faq.ssa.gov/en-us/Topic/article/KA-02501

How you tried to get a transcript from the IRS?

Go to Get Transcript. If you can make the request online, please do so, and ask for the transcript to be delivered online.

I asked for a transcript on March 24, 2020 to be mailed to me, and I received it on June 6, 2020, so IRS paper processing is very slow.

You want a Wage and Income Transcript for the year ending 12/31/2019 - this will have your W-2 information (assuming your employer sent a copy to the IRS, as they are required to do).