You have Pendle within reach and that has lots of options for varied runs. You can check out the Tour of Pendle, Pendle Cloughs and Stan Bradshaw race routes, maybe follow them and then mix and match as you become familiar with the area.
Some of these routes start/finish on road and there are some firmer sections on top such as the trig - nick path - but even a long that there are options to run either side and stay on dirt/grass.
Very easy to clock up 4 hours and over 3000 feet.
18th Nov is the Tour of Pendle Race.
https://tourofpendle.co.uk/
You could head over, park at the Nick (above Sabden)and follow it around as a spectator to get a feel for it.