I don’t think people who finish low down should get the chance to stay in their division either playing playoffs against a team that did well in the division below. Straight 3 up, 3 down in each league would be great, no playoffs. But again I’m just being selfish for my own desires.
The only way this works is to combine Divisions 3a and 3b since both divisions provide two automatic promotion spots and two playoff spots, but that would mean 24 teams in one division, and the only way this works is to play double fixtures every weekend, similar to the English Championship League format. Make it three automatic promotional spots and one playoff. We normally have doubles fixtures in cup games, so this will work.
It's obvious nobody wants to waste their time in Division 3 with little to nothing to achieve for 3-4 months of research. We already made division 2 something closer to division 1, I think it long overdue to make division 3 something closer to division 2 and creates division 4 if needs be for newcomers.