Let’s say I’m able to identify a limiting belief I have and I want to change it in its positive counterpart, how do I do it?

For example let’s I recognise that I believe “I am too broke to be attractive” how do I change it into “I have enough money to be considered attractive”?

I ask this because on paper I have everything it takes to be deemed worthy but I still feel insecure about many aspects of myself because there are so many guys out there who are better than me in these aspects.

Assuming I’m actively working to improve them how do I stop doubting myself in the meanwhile?