Maybe you've seen it but I'm organizing a show on the Discord server where I try to speak both English and Turkish and sometimes my brain burns haha. But I don't say I'm sorry because my English is bad because I try my best and I try to improve myself all the time. I try to use different words. That's what we can do.
hahaha just never say that you're English is bad. Never apologize for anything tbh but keep on improving and you'll improve in no time.
How about saying I'm not good :P