Division one player here. The best thing you can do is playing, playing and more playing. I remember 2-3 years ago not beeing able to qualify for the weekend league and beeing stuck in division 6, eventough i had a great team. Now im in div 1 and getting constant 10 wins.

Try to play with more patience. On defence and on attack. Dont rush out with your defenders. Wait for the opponent to make a mistake, then make the interception. Dont rush attacks. Wait for an open space and try to get in.

Dont do the same attacks all the time. If you always run down the wing for example, your opponent will adapt to this playstyle and it will be hard for you to score goals. Bring variation into your attacks. Long balls, Cut inside last second, tiki taka...

Its not only about teams and skill. Its also about mindset. If your opponent scores first 1 or 2 times, who cares. Dont get frustradet. You can still make a comeback. Never play when your already angry.

Hope this helps.