How do I work on developing a thankful heart?
1: Confess and repent of any ungratefulness when God exposes it
Proverbs 28:13 ESV
Whoever conceals his transgressions will not prosper, but he who confesses and forsakes them will obtain mercy.
2: Yield your rights to God
— Galatians 2:20 I have been crucified with Christ. It is no longer I who live, but Christ who lives in me. And the life I now live in the flesh I live by faith in the Son of God, who loved me and gave himself for me.
3: Count your blessings
Bless the Lord, O my soul, and forget not all his benefits,
[Fanny Crosby example]