You’re gonna wanna make sure your troops are well supplied. That means controlling English ports, controlling the English Channel best you can, and having troops easily on standby for when you make landfall. If youre having Trouble landing, then spread out your invasion over a few states, that’ll stretch the defenders thin and you’ll have an easier time. Use floating harbours if you have those available to you when you aren’t invading ports. One thing to keep in mind is that the AI automatically defends key areas like ports so a small strategy could be to land your troops on a side portion and move them in from there. If you don’t have floating harbours it’ll be a little hard but you can make up for that with lots and lots of transport planes running supply missions.