You are going to get tired of holding on

hold on anyway.

You are going to want to let go

hold on anyway.

You will forget sometimes why you hold on

hold on anyway.

You will see everyone else letting go

hold on anyway.

You will be mocked or criticized for holding on

hold on anyway.

…holding on = hope…

Hope for something better

Hope for mercy

Hope for a new chapter

So you just keep holding on.