The Prophet (ﷺ) would say this dua:
اَللَّهُمَّ قَنِّعْنِيْ بِمَا رَزَقْتَنِيْ وَبَارِكْ لِي فِيهِ وَأَخْلِفْ عَلَيَّ كُلَّ غَائِبَةٍ لِي بِخَيْرٍ
Transliteration
Allaahumma qanni`ni bimaa razaqtani wa baarik lee feehi wa akhlif ‘alayya kulla ghaa'ibatin lee bikhayr
Translation
O Allah, make me content with the provision You have given me and bless me in it and appoint good for me in every thing which I do not have.
Say Allaahumma innee assaluka ilman nafia, wa rizzqan tayyeebun, wa amalan mutaqabilan. You are asking for good knowledge, halal rizq, and deeds Allah accepts. More barakah comes this way.
Try this: O Allah, O Lord, O everliving, O self-subsisting, O owner of splendour and generosity, use Your great ism azam to bless me with lawful, pure, and plenty of sustenance through Your mercy, O the most merciful.
Ask like this: O Allah, I want Your favour. O Allah, forgive and have mercy on me. Guide me. Keep harm away. Give me sustenance and salvation. I want good rizq and deeds You will accept.
Use this dua: O bestower of benefits, O pardoner, O affectionate, give me lawful sustenance and keep me from disobeying You. Let me obey always. Save me with Your mercy from depending on others.
For success in everything, say Allahumma inni as'aluka al-najah fi jami' al-umur, wa a'udhu bika min al-khudhlan. You ask Allah for success and help so nothing fails.