In Tafsīr Ṣirāṭ al-Jinān, it is stated in the commentary of this verse:

When the people of ʿĀd rejected Prophet Hūd عَـلَيْـهِ الـسَّـلَام and his message, Allah Almighty did not allow rain to fall upon them for three years. A severe famine set into effect, and their women were made infertile. When panic and worry heightened, Prophet Hūd promised if they believed in Allah, repented to Him, and accepted His Messenger, rain would fall again, and they would be granted new lives by way of the fresh greenery that would spring forth as a result. They were also told they would be granted strength and offspring.^[1]

Piety

Allah Almighty says in His Quran:

وَ  مَنۡ یَّتَّقِ اللّٰہَ  یَجۡعَلۡ لَّہٗ  مَخۡرَجًا ۙ)۲(

وَّ یَرۡزُقۡہُ  مِنۡ حَیۡثُ لَا یَحۡتَسِبُ ؕ وَ مَنۡ  یَّتَوَکَّلۡ عَلَی اللّٰہِ  فَہُوَ حَسۡبُہٗ ؕ

And whosoever fears Allah, Allah will create for him a way of salvation. And (Allah) will provide him sustenance from where he could not (even) imagine; and whoever relies upon Allah, so He is sufficient for him.^[2]

Dear Islamic brothers, becoming pious and having taqwā leads to an increase in rizq. سُبْحٰنَ اللہ Look at the immense blessings of this; whoever becomes pious is given rizq in a way he would never have even thought of before.