Where do you buy swimsuits these days?

I'm a 30 year old woman and have no idea where to buy a swimsuit. My apartment building has a rooftop pool (brag) and I didn't even use it last year (besides just laying on one of the lounges) because I couldn't find a suit I actually liked. I feel like as a kid, my mom took care of this kinda thing and just got me a swimsuit from wherever she was shopping that day. I didn't care! Camp kids didn't care! But now... I feel like I have to have something semi-cute but also something I'm comfortable in. I've tried the IG-friendly ones, like Summersalt, and wasn't crazy about the one I got. But maybe I just didn't get the right style! Looking forward to your suggestions — it's getting hot in my town, and mama is ready for the SUN!