Hi
@Zeigermaher
Welcome to the forum, and welcome (in advance!) to country.
There is no real structural difference between level 7 and 6, level 6 is more your first stepping stone to the higher levels. Worth going for promotion from 7 to 6, but there is no rush.
At level 7 you can still do a range of games as referee, OA (open age - adults), youth football, anything from U18 down, Saturday leagues, Sunday leagues. Plus you will able to do the line on some higher league games.
My suggestion would be to spend this season as a level 7, finding out about the structure of English football, what leagues you want to officiate on, and then possibly embark on promotion the following season (starting June 2021)
once again, welcome!