First post to this group so apologies if this is one off those topics
regularly discussed.

My lawn is in 'fairly' good condition and fortunately big enough to justify
a ride on mower.

There is a 'drop' in the lawn where it appears the prevoius owners were
going to lay some foundations then decided against this.

As the mower approaches the drop (not huge ~6", and sloping) and subseqent
rise the lawn is destroyed by the mower which can not handle this slope.

I would like to level this part of the lawn.

How do I go about this? - Loads of top soil, roller to flatten, then seed ..
is that it?

Many thanks for any suggestions.