Our accounts are similar. We been on here for a while, improved decently over a lot of tests. And we both have bad accuracy. My suggestion to you, take the instant death typing tests and suffer through. My speed increased 5 WPM permanently in like a single day.

Be consistent and don't strain yourself, your brain will only learn the after you have had some rest.
Often a tune can help, because your brain frequencies will align with the song.