I have heard of trying to widen the back of your throat, you can do it by yawning (u can kinda feel the space near your uvula expand). also talking like patrick star (but without the valley girl accent he has lol). another trick i’ve been practicing is trying to sing along to arctic monkeys songs as low as you can go (totally ignore if it sounds bad, that’s luckily not the point of the exercise). also there’s a ton of youtube tutorials on the topic :)