Some tics unfortunatky cannot be surpressed, it depends on how seveir they are, but to help them id recomend everything you do that makes you the calmest, I personally recomend keeping a hold of your breathing and trying not to think about them because I've found personally for me, the more I focus/hyper focus on them the more they happen. Try bringing a fidget or comfort item to have with you and try to focus on other topics/activities other than your tics, if you have someone that can engage in a convo with you, that can help to! I hope you find something that works, everyone is diffrent

I find if its a motor tic moving that muscle around can help. For vocal tics humming or speaking is sometimes helpful. Some tics are caused by a dopamine deficiency in this brain, this means doing things that make you happy, exercise, video games etc can help. Huberman Labs podcast has a great episode on dopamine that has some other tips. I hope this helps! Also, remember that tics are not your fault and you have no need to apologize for them.