Errors in my router zyxel VMG8623-T50B

I'm here for advice on securing my zyxel router. I have ADSL internet from the ISP Vodafone. In recent days, my internet at home has slowed down significantly. I set up several ACL rules but I still get attacks. Could anyone advise me on any steps to solve or secure it? Thank you for any comments. I'd rather not bother you with the wrong format, I uploaded it for download :D LOGS

Question by Matěj Hrabák on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.