You shouldn't be practicing chords 3 hours a day, you get over tired in your fingers and it gets really boaring and that is what brings you in this rut.

it 's better to practice half an hour to one hour a day but with a practice routine like first do stretches ( important ), then exercise chords and chord changes for about 10 to 15 minutes but with easier chords that naturally belong together ( not Am to Gm, don't get stuck on the chords for that song that you want to learn especially but start with chords from easy songs, there are a lot of people that want to learn to play the guitar because they want to play Sultans of swing from Dire straits as fast as possible but it doesn't work that way, it's a long slow process taking baby steps to get there.)

Then practice some scales with a metronome for about the same time and then spend about 15 to 20 minutes on a very easy song untill that works fine before moving on.

Once in a while toake a sneek peek up ahead to keep the hunger for more burning.

Follow this and you will see a difference after some time.

Herman