Leaving car parked for a month

So I am a new tesla owner a 2019 M3, under a month with it. I am going on a vacation for month. I need to leave my car parked at my apatment for that time. My personal parking space doesn't have a charge port available, yet. Should i be worried that the battery will naturally drain in that time? The parking garage is underground and heated 15C (~60F). Haven't ran the test battery lifecycle test the car can do it self. The car has 115000km (~71k miles). Any advice or tips is highly welcomed. Should I charge it to 100% and leave it (I know it effects the life of the battery, leaving it at 100) or should i leave it at 80%. OR should i find a place where i can leave it parked and plug in once I am back?