if one of my fren-emies gave it to me for free, I'd probably try to roll the dent out, then set up some blocks on a level-ish basement floor and apply copious evenly distributed pressure to convince myself I've got it kind of aligned.
and / or take it and a bag of coffee beans to my LBS on a slow winter day and see if the owner will do an in house tool loan. (last time i mentioned bringing a mix-6 pack, but he said he's trying to get back into cycling shape - he and his family had a rough go of things with a very sick kid and The Covid Times....)

cheers!