If you have concerns about your current attorney, consult with a second attorney for an hour or so. You can bring to that attorney all your materials and the pertinent pleadings so that that attorney can provide a proper assessment. No one at this web site can provide a proper assessment without seeing your evidence, and evaluating the defense.
Keep in mind that settlements generally occur because both sides fear the risk of trial, and want to avoid the time and expense of trial. In other words, a sum certain is preferable to the unknown roll of dice at trial.
It's impossible to say what an appropriate range would be for a settlement without knowing a lot more information about your case. If you have reservations about your current lawyer you should hire another lawyer to offer you a second opinion based on the facts of your situation.
Don't automatically assume your lawyer does not have your best interests in mind. Your current lawyer may be giving you a realistic assessment of the value of your case based upon the strength of your case, the strength of the employer's case and the law. Employment discrimination cases are lost by plaintiffs about 50% of the time and the laws governing employment discrimination limit the amount you can win at trial so the value of your case is not strictly based upon what you can prove but legally what you can accomplish with those facts.