vaccinate or not?

I’m fully vaccinated more than six months and the sms keep sending to me asking to take the booster. Really worried of booster will cause harm. Not much data for that yet and people around me experiencing much more serious effect after the booster. And is it even necessary to booster jab when we don’t even know we might still have enough antibody in me. I really wish moh and gov be more transparent esp to the vulnerable one during this period. :(