git forced merge and branch delete questions.

Hi, everyone. I'm using git There are about 6 branches;

I'm using only one branch, but it's annoying to merge, so I delayed it day by day and came to Lee Ji-kyung.

The question is I'm trying to force the latest branch under development to be overwritten by the master branch and delete all the other branches, but I don't know if it's okay to do this; If there's an error, it's very...I think it's going to get serious, so I'm going to ask you a question.

First of all, the current branch

Create Branch 2 from Branch 1, Create Branch 3 from Branch 2, Create Branch 4 from Branch 3... It's like this I am hesitating because deleting the previous branches will affect the current branch.

I'd appreciate it if you could give me some advice!