There's a neck mount you can get which may be useful.
This can be rotated for portrait and landscape shots (although not needed if shooting with the GoPro Hero 11 due to it's ability to reframe).
Lighting is the next big thing, you may think that your lighting is ok (because it looks good to your eyes) but how it looks on camera will differ greatly. It's no use being the best chef in the world who makes great tasting food, if it looks unappealing on camera. Your audience can't smell or taste your food, so that leaves them "looks" to go on. So lighting is hugely important in this case.
Although for cooking, I'd use a multicam setup. One overhead looking straight down, one looking at the cook, one for close up shots when you want to show ingredient measuring, action shots (whisking, folding, kneading, etc). So GoPro, phone camera, any other type of camera you have that can record quality video.
Without a multicam setup, you're looking at using the one camera multiple times for each angle.
Once you get up and running, do a dry run (as in pots, pans, no ingredients or cooking) to check your camera angle and to practise your dialogue (and delivery).
Share your YT channel (put your first video's up as unlisted) and get feedback on what you shoot and ways to improve your shots. Having a "test" audience who gives honest feedback on your video before you go public will be a huge advantage. Your test audience should not be your friends or family as their feedback will be biased, and although they may mean well, this could hurt your video's overall.
Shooting everything "first person perspective" isn't the ideal way to make videos as it can get disorienting for the viewer. I'd look at getting a Jaws clamp with a long gooseneck attached to give you a great range of angles and where you can put your camera.
These can attach to your oven handle, cooker hood etc. The longer length of that clamp gives you the ability to move your camera around more from where you've clamped it.
Finally you'll need a good quality video editor. You'll find very few (successful) video's online that are solely edited on a mobile phone. So the ability to edit quickly and easily on a PC (especially if using multiple cameras) will be a must.
Good luck!