Grind out battle pass and lower tier events, those planes can be premium
You should’ve gotten the event tomcat. Most pleasant aircraft to fly for me so far, I know it got put up against Typhoons and Rafales with the new set of BR changes but it may get R-73 to compensate.
The Economy past about Rank V/VI is basically designed for you to have either Premium time or a premium vehicle. Ideally both. You could try a Rank III premium, they are about £10 and give you both something to farm SLs in and something to grind the event in, Pick something good and it should be fairly easy
30% off April maybe. But probably not until June for the Packs I think. In the June/July sale it would be about 30gjn ish I think. But dont quote me on that