In terms of game jams, teams still tend to be on the small side so obviously roles will get "compacted" and team members will wear multiple hats. You also really do not need GDDs for the conplexity of the average jam game.
As someone who is a programmer by daylight, I want to do my own game design when I do gamedev so I am flat-out not looking for a game designer. For me, that's the "juicy" part.
So having some other skills (e.g. also being able to do art) are gonna increase your odds of being able to find a team where you get the "game designer hat" compared to if you only can do game design.
Best case would be if you were able to do solo projects, of course - that way, nobody can tell you what to do! So learning to program, at least in some sort of low-code environment, might be worthwhile. Or maybe you could try your hand at a board game, with zero programming required.
Will any of that stuff help you to break into the industry? Iunno. I'm not in the industry and have no desire to be.