Helo @katie-13 a chroeso yma.
@delawarejones spoke about where you can head to for some additional Welsh matters and I’ve remembered there’s one community of American Welsh learners on FB. It’s called “Ameri Cymru” and you find it here. They also have separate site on FB which aims only to post resources for learners and interesting stuff there and you can find it here which admins of both is “Ameri Cymru - West Coast Eisteddfod”, the third site where you can find quite some resources, too.
I’m also very glad you find this site a great one. Always gerat to hear this.
Now just go for learning Welsh.
WARNING:
With using this site and course with it you can very easily end as a good if not excellent Welsh speaker! 
Side effects: you can feel very eager to learn more and more each day and at some point you’d rush to find the speaking partner or conversation group.
(If This isn’t good I don’t know what is! )
Now you know all!
Hwyl!
Tatjana