#1
I have learned the 5 positions of the pentatonic after many months of repetition.

What other things should be learned next?
#2
You've barely scratched the tip of the iceberg..

I would say things to work on:

Building technique
Songs
Ear training
Theory
Improvisation
Writing own material
Play with other people
And forget about "lead guitar" and start thinking about "guitar".
Fusion and jazz musician, a fan of most music.

Quote by Guthrie Govan
“If you steal from one person it's theft, and if you steal from lots of people it's research”


Quote by Chick Corea
"Only play what you hear. If you don't hear anything, don't play anything."
#3
Quote by sweetdude3000
I have learned the 5 positions of the pentatonic after many months of repetition.

What other things should be learned next?

Instead of thinking of "lead" guitar, think about guitar in general. Even if you stick to the idea of having a lead and rhythm guitarist, you're going to be doing rhythm parts 80+% of the time.

If you've learned the five pentatonic positions, next you should learn the five basic positions for the major and minor diatonic scales. Then learn how to construct major/minor diatonic and pentatonic scales.

musictheory.net is a great resource for learning basic theory like that. Look through the lessons and try to apply those ideas to your playing (though bear in mind that theory isn't a set of rules, so don't feel restricted).

As for technique, I'd say work on making your alternate picking as small and economical as possible and build good hammer-ons and pull-offs.

Above all else, learn songs you like! That's why you're playing the guitar, isn't it?
#4
Be musical when doing 'leads'. Make sure not to play scales for the sake of it

Quote by FryingNemo
I saw Satan one day
He looked kinda gay
The bible hates gays
So Satan I shall slay
Amen.
#5
Grab yourself some backing tracks off youutbe using the tonic positions. You'll be amazed at what you can do with those notes in all their positions. Add in some bends and you can make music with two strings