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Could you add the "Flight" and "Dimensional Door" spells? Let them have a short range and consume all mana, so they wouldn't be overpowered like in the third game.
Allow players to choose before starting a mission how many ability points (Readiness, Basic Education, etc.) they will receive per level – for example, 1, 2, or 3. But keep everything else about the level the same as usual. Then, it would make more sense to aim for a super ability, which is currently only achievable in the campaign. In the third part, you can fully level up by level 21-22. And you don't need a huge map for that. On large maps, you already have all the abilities by the middle of the game. And that's fine, unlike the fifth game, where it's very difficult to fully level up, and in the fourth game, it's simply impossible. Especially if you're making eight abilities instead of six.