Hello, Thank you for your question. By 5,5 months you should expect more growth, but you still have at least 6.5 months to see the final results. Contact your surgeon, he might suggest you some treatments which would help with hair growth.
You are always best suited to wait the full year before judging the success of a transplant. At 5 months, you are just at the early growth stages. If you have concerns, it is best to discuss with the doctor that performed the procedure to see what options are available.