I would try disconnecting the battery for about an hour then reconnecting it. First, if possible, make sure you have any security codes needed to reactivate things like the radio. Check the owner’s manual. It may not help, but it will not cost anything.
What exactly does it do or not do when you try to start it? Does it make any sounds at all. Do any lights work? Do any gauges come to life? Have you had the battery tested? (not the same as recharging it.
My guess (in this case it is a wag not a swag [Scientific Wild Ass Guess] is that a relay somewhere may have burned out or is sticking.