What Happens to a Muslim Who Struggles with Faith and Hard Times?

Hey everyone, I need to ask something that's been weighing on me, please take it seriously if you have any insight. Could someone who's Muslim but goes through with ending their own life ever find forgiveness and enter Jannah? Like, what if they were in deep pain, battling major depression or crushed by loss, and they felt like there was no other way out? Would Allah's mercy still reach them? I'm trying to understand if there's any chance-or if they'd face punishment and suffering instead. And honestly, if that's the case, I want to know why. Does making lots of dua or praying enough change things? I'm not looking for false hope or vague answers, just real clarity based on Islamic teachings, because I know it's a serious matter and not something to take lightly. Could their good intentions-maybe even a desire to draw nearer to Allah-make a difference? What about someone who doesn't pray regularly but still believes in Allah deep down?