How can my misaligned teeth after braces be fixed? (Photos)

I have 23. Male. I did ortho treatment on 1.5 year back. and the duration of treatment was 8 months. these 8 months, braces are used. and take off 4 tooth to get gap for arrangement.after these 8 months of treatment, the braces removed and improved my tooth. the doctors gives me a stabilser for 6 months. i was used it properly. but, recently my 2 upper front tooth are twisting. As shown in the picture. there is no any gap remain. THANK YOU

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