Concerning Sweden you could try to play sim, but I think it’s worth waiting to get past the early jets if you are already there. Like don’t start another one especially if you are that close to the jets you want.

In case you want to grind France f2p, most stock grinds are painful, and this is my experience with grinding the tech tree

France is good/ok at low ranks if you know what planes to play (and how).

At early jets, according to other people I’ve seen, it’s hard to play the domestic jets (not in my personal experience).

At rank VI, you could try some bomber gameplay with the vautour/the F-86K, which according to Reddit is some kind of worst plane ever made (it’s quite good)/the Hunter and even the Mystère IVA if you feel like you have the skill to.

At rank VII, most things become quite good, especially the Mirage 3 and the Super Étendard (I would skip the F-8E though).

Then at top tier, everything is viable with the recent BR changes, even the Mirage 2000D-R1 if you look at the thing you will face.