You can name every chord in the key. You know what a secondary dominant is. And then you pick up the guitar and out comes the same progression you have been playing for six years.

That is not a knowledge problem. Theory, the way most of us learn it, gets stored as facts — the vi chord in C is A minor. Playing does not run on facts. It runs on reflexes, and your hands have a far smaller vocabulary than your head does. On guitar you might know fifty chords and own eight shapes. Under the mild pressure of actually making a sound, the eight shapes win. Every time.

So the fix is not more theory. It is operations — small, specific things you do to the chords you already play, until doing them is itself a reflex. Below, put in a progression you catch yourself playing. The page will tell you what it is, then hand it back to you thirteen different ways, on your instrument, with the sound of each one.

None of these require you to learn a new chord. That is the point.

① What you actually play
Type the chords your hands go to on their own — spaces between them. C G Am F, Am F C G, Em C G D. Slash chords and sevenths are fine.
② Which rut is it
Be honest about the shape of the problem
These sound similar from inside and they have completely different exits. Pick the one that stings and the moves below reorder to put its fix first.
③ Thirteen moves on what you already have
Open one. Play it before you read it.
Each move is computed from your actual chords, not a generic example. Compare the two buttons — the difference between them is the whole lesson, and it lives in your ear, not in the words.
Show me on
Open
Root Third Fifth Seventh / colour Lowest note
④ Tonight
Ten minutes, one move, one key
Reading this page changes nothing by itself. An operation has to get into your hands before it can show up in your writing, and that takes repetition, not understanding — you already have the understanding. This is short enough that you will actually do it.
The principle underneath
Constrain, don't expand More options make the rut worse, because the habit is the path of least resistance and more freedom is more resistance everywhere else. Taking something away — no root in the bass, only three strings, one chord per two bars — forces a choice your hands have not already made.
Operate, don't invent Staring at a blank page asking "what chord is interesting" is a terrible prompt. "Take the chord I have and lower one note by a semitone" is a great one, because it is small enough to answer and the answer is always musical.
The bass note is most of it Non-musicians cannot name a chord and can absolutely hear a bass line. Changing which note is on the bottom changes the emotional content of a progression more than changing the chords does, and it is the single cheapest move on this page.
Your ear is the judge, not the theory Every move here has a name and a justification, and none of that matters if it sounds wrong in the song. The theory is for generating candidates quickly. The ear picks. Anyone who tells you otherwise is selling a course.
One thing at a time Apply two operations at once and you cannot tell which one did the work, so you learn nothing and the next song is a guess again. Change one thing. Listen. Keep or discard. Then the next.
Steal specifically "I love this song" teaches you nothing. "In the second chorus the bass drops to the third while the chord stays put" is a move you can use tomorrow. Run something you love through the Song Analyzer and look for exactly one thing.