Hello!
I just bought the same accordion.
I live in México and I looked for information about accordions. I like “música norteña” and I found that the Panther is the most suitable for that kind of music.
As you say the language is a bit of a barrier but well, I met “Acordeonísticos” on YT. César is the accordionist on the videos. Also, I met Roma, he is another mexican accordionist on YT. Roma has a series of lessons on udemy.com, I bought them (like 10 dollars) and those are very nice for beginners as I am.
Oh, by the way, César from Acordeonísticos also has the option to buy “canciones norteñas” (“nortenio songs” I think people call them). He explains how to play them.
Well, I am new around here but I am sure that you have progressed a lot.
Kind regards.