I can change my thoughts and mindset with practice.

Practice is the honest word in this. Not decide, not realise. Practice, with everything that implies about repetition and unglamorous failure.

When a road closes, the first week of the detour feels wrong every morning. By the third week your hands turn the wheel before you've thought about it. The old route is still on the map in your head; it has just stopped being the default.

Thoughts work that way too. The old one keeps arriving. What changes, slowly, is how long you stay with it once it does.