hello and welcome to HCM,
Whether to remove the grommets or not is completely up to your symptoms
I am guessing that you are a frequent air traveler and since after the insertion of the grommets you are feeling much better then you can continue to use them as it will help you especially during landing and take off. In any case, most grommets will get extruded out in a time period ranging from weeks to months and rarely years depending on the type of grommet used.
Now if the only indication of grommet in your case was flight travels and you have reduced the same that is you do not do frequent air travel then you may consider removing them. This is also the case if the tinnitus
is becoming severe and even a small noise is causing discomfort. Also if you are feeling that your hearing is getting reduced then it is better to get an audiometry
test done and decide in terms of removing the grommets
meanwhile do not allow water to enter the ears and do not get exposed to loud noise.
Dr Sriram Nathan