CamillePunk

Then you need to address the problems individually. Long shots: Are your players in the correct position to close down the opponent before they have their shot? Is your goalkeeper lacking in his ability to deal with shots that shouldn't be so threatening? Set pieces: I would advise taking a look at set piece videos on Youtube or something to get good set piece routines. Personally I will stuff the 6-yard box with my tallest players, emphasis at the near and far posts (not marking the post), and I rarely concede from these. Just keep 1 attacker going forward and a couple of your smaller players forming a wall or something. Everyone else should be in the box. This is my approach with defending both corners and free kicks. Passes in behind/crosses: Again I would look to see if you are losing the ball cheaply and your defenders aren't in a position to deal with it. Might need to pass shorter or change up a role in midfield. Otherwise it could be worth dialing back the high line and pressing a bit in these matches given the quality of your opponents. Also important to keep morale and team cohesion as high as you can to boost positioning, teamwork, and reduce mistakes. Praise good training performances every week, schedule teamwork match prep every week, etc. Personally I also regularly schedule team bonding as a low impact exercise to boost cohesion and so that my team isn't working themselves to death every day in training. Set piece training is good for the latter as well, and it also affects the performance of your set pieces in your next match. Defensive set piece training is a good idea when going against good teams that will have a lot of set pieces against you.

My questions based on your tactical set-up: Do your center-backs have the quickness, positioning, anticipation, and concentration to play a high line? What is the gap like between your DMs and your AP? Are they able to get the ball to him without giving away possession? Does your AP have options when he is on the ball? Does he have the vision, composure, and decisions to pick out the right options and not give the ball away? If you are not able to distribute and keep hold of the ball, this could lead to dangerous counter attacks, which will be especially successful against your high defensive line. You're also doing a lot of pressing. Does your team have the work rate and stamina to pull this off and maintain it over 90 minutes? And when you are conceding, is it because your team is out of position due to constant pressing? You need to look at the goals you are conceding and look at what is actually unfolding on the pitch. How the opposition chance began. Where your players were and why they were there, etc.

Great success so far. When will you be looking to move to a Top 5 league?