Amauri
For anyone who enrols in the career of a professional pilot they owe it to themselves to at least get the CPL and give themselves a shot at getting hired by an airline.
The OP has a job, and very quickly after completing training although had to wait 6 months before starting groundschool. It seems that he has entered the dreaded spiral of despair following issues in the sim, extra training and further delays. As has been said, this is not uncommon and if he managed to get through the CPL/IR MCC training without delays or setbacks I would say he has done very well so far.
stormtrooper1
It might be helpful to know what the specific problem area is? Consistently poor landings have been identified as a particularly weak area in recent years and you may be surprised to hear that this is not only in initial type training. For example, after a number of poor landings on the line following recent conversion leading to a couple of unsuccessful sessions in the sim, the F/O was assigned a senior TRE (great instructor) for an assessment. First approach became unstable below mins and an attempt at a landing was horrible. TRE climbed into the LH seat and noticed that the tall F/O's seating position was too high resulting in an awkward right arm position. Two issues - eye datum point was wrong and consequentially, control input was uncomfortable due to elevated elbow. Apparently, the F/O had never been shown how to select the correct seating position nor how to check EDP properly. Basic training conducted in the U.S. as part of an integrated course then initial type training on the 'bus at another airline. Once corrected, the session went very well and the TRE sent him on his way relieved and no longer frustrated. Seen similar with shorter candidates as well - but of course, this is only an example; the OP could be having issues elsewhere.
Good luck though - you've done well so far and it would be a pity to throw in the towel after all that effort, and so close to your objective.