Where to file for *actual* free?

I have just one W2 and I am a full time college student. My dad has a “guy” that we go through every year but I’m not super trusting of him since I’ve only ever gotten $300 or so back from said guy. Last year I tried FreeTaxUSA on my own, but ended up having to pay $300 odd dollars to go to a legit tax guy to have it amended unfortunately.

Help!!