By way of zikr, the best of zikr to thank Allah is to recite 'SubhanAllahe wabehamdihe subhanAllah hilazeem' as much as one can. And, by way of acts the best way to thank Allah in my opinion, brothers and sisters, is to OBEY ALLAH AND OBEY HIS RASOOL(SAW). Accept RasoolAllah(SAW) as the true leader(surah An-Nisa',ayah 65); Bring every desire in submission to the decision of RasoolAllah(SAW)[surah Al-Ahzab,ayah 36]. Proof of love for Allah is in obedience to RasoolAllah(SAW)[surah Al-'Imran,ayah 31&32] and Surah An-Noor, Ayah 52 tells us that our salvation rests in obedience to Allah and RasoolAllah(SAW).
Pray for yourself, pray for your near ones and pray for the UMMAH - may Allah guide us all to be what Allah ordains us to be. Ameen,suma'ameen.