You are rated 1444 atm.
Blunders

I don't know when your blunders happen, or if it's a tactical vision thing (and if you want to improve at chess you must do tactics practice/training consistently!) but I have a piece of advice for you which was given by a GM in a video I saw long ago:
If you ever feel your position is on the verge of becoming completely winning OR losing, spend all the time you need to come to the correct evaluation and find the best move. Never move impulsively in a position where everything hangs in the balance.

ask a more experienced mature player to analyse some of your recent games and show you your weakness .once you know what you are doing wrong you can work on it .



i suggest you watch John Bartholomews original Climbing The Rating Ladder series. I cannot speak highly enough of it. I can safely say that blunders are pretty much a thing of the past for me now and that series helped me improve immensely

I used to have th same issue. The "truth" is this is not the issue: You can NOT assess a position as winning if you don't know how to win it, which means you HAVE to see the tactic present in the position and take them into account for your assessment of the board.
For me, the trick was to play slower time controls and focus on positionnal chess. When you understand well what is happening in a position, you will develop a 2nd sense for where tactics can happen.
I'm pretty sure that if I was looking now at the positions that a few months ago I would have said: "I'm winning but I blundered a piece", my assessment today would be "the position is not so clear because opponent has dynamic compensation" and I would be more careful.
The more you understand the positionnal aspects of a position, and the less you are subjects to blunders. That's what heppened with me at least.
Maybe it also depends on the openings you play. I had to resort to play more "quiet" systems to improve the way I told above. I think it would be much more difficult to learn that stuff if you are a sicilian player for example, and maybe switching to calmer type of games can help you understand how tactics appear on the board, before going back to your opening of heart.
tl;dr: I had the same issue since I was "verbalizing" it the exact same way. I addressed this by answering "why do I blunder". The answer is "because I don't see combinations even though I understand the position, which simply means I don't understand the position well enough (my problem was understanding dynamics). => You don't understand the position as well as you think.
Hi . I began to play chess 3 years ago . Now i'm rated 1500 but i often blunder a piece . In fact i often find a way to have an advantage on my oppenent and at that point i blunder . What i can do to improve my concentration and blunder less than now ?
Thanks.
Excuse me for very bad english.