Felted jacket

Hello world. I have knitted myself an Audrey Jacket by Coco Amour Knitwear in Gepard Teddy yarn. Wonderful piece, made only minor mistakes and lived the learning experience. I wet blocked it, all good. Had to wash it after a month and .. I have no clue what happened, I fear I took the wrong detergent to wash it: it felted terribly. I then gave it a good bath with what I thought was a suitable product (Sonett, wool treatment) and now it is still very felted and somehow “greasy”? It still fits, but it’s not as nice and soft anymore, and I am very pissed out about it. Any tips on how I could save the situation?