So I am in the CL semi finals.... playing vs a team of all scouts and 7 stars, all with abilities, and he's about a star better than me average.

I play 451V with normal, down the flanks, own half, normal, mixed, zonal, with offside trap.

He plays 4222 Narrow Diamond.

The first leg is at home.... the result... a 4-0 win?

This was of course most unexpected. Now the question is, what do I do the second leg?
What does one do with a 4-0 advantage, and owning all tie breakers, vs a clearly superior team?
I could run the same tactics since they clearly worked like a charm, but is there any foolproof way to hold this lead?

Thanks!