Question

Hello,
I wanted to consult the Rabbi about a moral and halakhic question.
About a year ago I started working at my current job. It was a few months after I had been fired from my previous one, so I took the first place that accepted me despite several drawbacks.
 
Before signing the contract I was required to agree to work for two years, and I agreed (I do not remember exactly what the wording of the question and answer was). In addition, a clause was inserted into the contract according to which 1,000 NIS of the salary each month is considered a two-year retention bonus, so that if I leave before two years have passed I will have to return the amount accumulated from that.
 
 
Over the past year I continued to receive suggestions for job interviews and so on from recruiters I had been in contact with in the past, and until recently I automatically turned them down.
Recently I have started to gain a bit of confidence. In addition, in certain respects I have been somewhat disappointed with my current job compared to what I had understood in advance (though, to the best of my understanding, there was no intentional deception here).

Therefore, I started thinking about the possibility of moving to another job, if I am accepted to one that seems significantly better to me even before the end of the two years.
 
On the face of it, this is a breach of my promise, but some people I know argue that this is not a binding promise but only a statement of intent, and also that if there is a penalty in the contract then the meaning of the commitment is simply repayment of those sums.
 
What does the Rabbi think?