The difficulty in this level in North Africa is that Rommel could not defeat the British alone, nor could he defeat the coalition forces of Greece and Australia. And your cruiser is a soy sauce... Go north, it will be almost finished by the time you get to the battlefield; go south, it will take a lot of time, but at least it can be compared with a Greek ship, and it will be effective. Delay the progress of the Greeks.
On land, what you have to do is to split your troops as much as possible to support the two wings while breaking through the Australian position. The Australians will defend you while dividing their forces to attack, so you should not invest too many troops in blitzing Australia. Just use a few more armored vehicles to enclose the territory.
Your main force has to support the two wings, (especially Yidai, who is basically a small sufferer when facing two opponent generals... although Yidai has always been a sufferer...) If If you can consume all the opponent's first wave of elites, victory will be easy.
The third level of the Allies.
Montgomery is a dead man against Rommel...De Gaulle is more suitable for politics...The Australians are basically destined to be soy sauce...These three allies are actually not very reliable, but you will be stunned. With a lot of energy tied up, it is difficult to effectively support them. The most reliable allies in this level are actually the Greeks - their initial birthplace is in Taojiao. With you behind you, you can effectively protect them. As long as you can kill the stunned generals and the first wave of elites , then the Greeks can completely kill Yidai alone.
After killing the first wave of Yidai in 3 or 4 rounds, the whole army will move north. At that time, de Gaulle and Montgomery should be lingering on, still breathing a sigh of relief. Separate a few armored vehicles to go around the empty back garden of the German army, and the main force went to kill the nearly exhausted Germans. Victory will be yours.
As for the navy...this level is really unreliable.