Hey, will there be a ch7 guide?
yes, the vanir guides are usually sold about a month after the chapter is released on itch. currently you can get it (with chapter8 and all the other guides too) if you become a vanir backer on patreon (25$).
if you are encountering difficulties in the chapter you can always join the discord server of the game and ask there (there is a link to the server above)