My Lg k20 has really bad game graphics could someone help me fix this?

Just to make sure there's no confusion, you posted this on the V20 forum, which is one of LG's flagship phones. It looks like the K20 is the budget little brother, with low end specs by today's standards. So I'm not surprised at all that the graphics when gaming on it are less than what you may have expected.

What you have, in gaming terms, is like a basic computer with integrated graphics instead of a dedicated graphics card.