A major contributing factor to moving forward in life is being able to let things go.
It could be physical possessions, people or memories and experiences.
An easy example is if you tried something and it didn’t work out. If you can’t let go of the thing that didn’t work you may find that it underlies future situations when you try something new.
Suddenly you’ve become someone that believes that nothing will work out for you, you become closed off to new things and remain stagnant.
That may seem extreme but that’s the reality of life. You won’t realise how much that one situation affected you until you’re randomly pondering life one Sunday afternoon.
I don’t think there’s one specific way to let go, what works for one may not work for another so it’s important to figure it out for yourself.