Regretting not checking builder track record properly

Honestly I'm regretting not doing my homework properly before booking. Rajkot mein Ansal Aastha Mig Zone mein ek 2BHK book kiya hai, 150 Feet Ring Road ke paas. Possession date 6 months pehle ka tha, abhi tak mila nahi. Builder bas naye dates de raha hai. My parents keep saying sab theek ho jayega, but I'm really stressed. RERA mein complain karna kitna effective hai? Matlab, if Ansal API delays more, will I actually get my money back or compensation? Aur builder ka legal track record kaise check karte hain properly, especially for red flags? I had no idea about all this legal stuff pehle. Should I wait or push them legally? Any similar experiences with builder delays in Rajkot? Bohot tension ho rahi hai.