Looking for my fellows (frenchs?) travelers

Hi, I'm planning some holydays to Guadeloupe in march. And I'm looking for advices or recommandations. The price of the plane tickets are so hight right now - like 900+euros. Since I prefer keeping the same company and not stay overnight in Paris, it kinda hard to have a decent price with decent condition. The best price I found was ~810 (I regret not buying it so much now aha). I'm in France btw.

Anyways, do you have advices like how many months before the purchase ? Does VPN actually works ? If yes, in which country should I use it to have the best prices ? Your recommandation of Local restaurant are welcomed or just share what comes to your mind when you were there !

Thanks in advance for those who help me :)