Somebody trying to hack into my hotspot

Is there a way how i can automatically disable the access for specific mac addresses if they are trying to log on to the hotpot with wrong username and passsword for to many times in a row?

Because in my log screen i see many tryings to access the hotspot with wrong usernames, )somebody is trying to hack the usermane and password.

Another question:
I want that just my computer is able to access the routerboard and usermanager, i want to disable the access to the routerboard and usermanager to all other clients. How to do this?