It will take a change of emphasis at the ECB and a couple of years developing a new side. I'd like to see Root lose the captaincy, even if it is just so that he can focus on his batting and get back to challenging Smith, Kohli and Williamson as the top test batsman in the world.
As for the rest, our bowling is ok, even if light on a spinner, but we just don't have a top or middle order. We have loads of bowlers who can bat a bit (Woakes, Broad, Archer, Leach) but one or two of them getting 15-20 runs at the tail isn't enough if the top and middle orders are like wet paper.
Too much focus on short form cricket (which had given us 2 great sides) has really hurt our ability in tests.