Want to hack webhosting account, i have only wordpress data, i think aswell ftp

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can i destroy, or make problems on this hosting account, do you have any ideas, i work with the guym a long time, he was a sales men, and i make websites, and digital products for him, he own me, to much many, and speak bad about me, i am sure karma will come up, he hurt me, so disrespecful, they are no words for that,. i work on this hosting, to much, with out paying me, in a other country,
guys if you have any idea, i will be really grateful, thank you I have wordpress entry, from one side, and need to look if i can find the ftp data