Too Late?

No!
No no no.
It is never too late.
If they are great friends, they will always be there no matter what.
Don’t wait for them though.
You need to make the move.
Contact them, tell them what you were going through and tell then you want to pick up the pieces and start over.
Trust me it is never too late.
I wish I could have fixed my relationship with my closest friend before she took her life .

If you’re friends don’t want to start over, then just be happy that you tried.

I only have one friend right now.
Seriously.
I have many acquaintances, but only one true friend.
It’s awkward, I will admit it.
I cut off two of my friends after high school.
I couldn’t stand there drama, but just r recently one of then messaged me.
She thought I hated her.
I messaged right away and told her that I didn’t hate her at all.
We talked a lot and it was just good to know that she now knows I never hated her.

I think you should try to get into contact with your best friend.
I would say write them an email or something.
Phone calls can become super awkward if you haven’t spoke in a while.

Don’t send an awkward “hey”
Send them a message containing things you miss about them.
Why you haven’t talked to them, what’s going on in your life, etc.
Then finish the message with asking them how they are and what they’ve been doing.

And end it with “I’ll understand if you don’t reply to me, but just know that I miss your friendship”