how can i edit current them to make icons rounded

i want to edit the patterns 1x1 theme here : ( https://themezer.net/packs/Patterns-1x1-Icons-59b ) so i can have slightly rounded icons like this theme : ( https://imgur.com/a/3EdR7Fd ) i want to change the home menu and all apps to have rounded icons. can someone tell me either how to do it or maybe even do it themselves if you dont mind, THanks :))