Help me help my cat

Hi everyone!! I have owned my first ever cat for a little over a year & she’s recently become more aggressive & I have no idea what to do!! I try to keep her away from windows (tons of stray cats around) but she busts through my blinds. Does anyone have a good method for keeping strays away & an indoor cat occupied while you’re away? I do play with her daily & honestly she ignores me a lot of the time. Today she scratched my hand and kind of guarded me at the table, very freaky for me. I don’t want to be afraid of my cat & I know it’s stress so any advice would be GREATLY appreciated!!!!!