God did promise us health, wealth, longevity etc. Genesis 12:2, Genesis 22:17, Hebrews 6:14, Psalm 91:16 etc
And 2 Corinthians 1:20 says, "For as many as are the promises of God, they all find their Yes [answer] in Him [Christ]. For this reason we also utter the Amen (so be it) to God through Him [in His Person and by His agency] to the glory of God." Amp.
However, He did not say there won't be problems and challenges but He said despite all the challenges and problems, we should be of good cheers because He has overcome them for us. (John 16:33), Psalm 34:19
What we should do in these times of challenges, knowing that God is true to His word (promises), is to reject the lie of the devil, resist him steadfastly in the faith and he will flee from you because he has lost from the beginning. (James 4:7),
1 Peter 5:8-9
- Be well balanced (temperate, sober of mind), be vigilant and cautious at all times; for that enemy of yours, the devil, roams around like a lion roaring [in fierce hunger], seeking someone to seize upon and devour.
- Withstand him; be firm in faith [against his onset—rooted, established, strong, immovable, and determined], knowing that the same (identical) sufferings are appointed to your brotherhood (the whole body of Christians) throughout the world. Amp.