Running Shorts Recommendations?

Usually I buy all my athletic clothes at target, but I’m boycotting right now. I’ve lost 50lbs this year by running, and almost all of my shorts are falling down unless I tie them super tight and hoist them up over my belly button.

Sometimes they will fit perfect before my run and then begin to fall the instant I pick up my knees. I’m also worried if I buy shorts that are too tight, they will ride up and cause chafing or show my junk too much. I’m going to try a size down, but does anyone have a pair of shorts that they swear by?