Yes, you should use older accounts.
To create them and start botting.
Create them, play 5 5 5 legit and break for 1 week.
Then start botting
*This is no guarantee to lower the ban rate//just my opinion
Maybe you should log in with all of them and play a bit legit just like lvl 5 5 5 5 combat stats.
Then break for a week and then start botting. (this may lowers the risk of a ban)