Naruto Shippuden? - 1

I can only watch 10 seasons from Naruto Shippuden on Netflix and don't know what to do next

Either wait until Netflix continues, or continue watching TVNow up to episode 423 with German synchro or complete with subtitles on Crunchyroll.

You can watch everyone on Crunchyroll but with subtitles

You can buy DVDs or watch the rest of Naruto Shippuden episodes on Anime on Demand. After that it would be with the Boruto movie on Netflix and then the Boruto series (scrap is not recommended). Otherwise you can just wait until Netflix releases the rest of the seasons.

You could wait until the remaining 10 or more seasons come or "legally" continue to look at proxers if you want to know how to proceed.

Tv now (until episode 423)

Wait until netflix brings more to come

Crunchyroll (ger sub)

Or buy the dvd