There are so many things to try, so many perspectives to see in this area. Everyone deals it in a different way. I will tell you what helped me.
1. If you feel you are stuck with same chords as I was with B minor,G and A for months, just pick up any non familiar backing track from Youtube and practice. It is tough breaking out from that comfort zone of known chord changes at first. But slowly you will see your fingers adapting to it.
2. Being creative is never easy. One who always challenges himself, questions himself, never satisfied with what he has to offer can think of being creative. (OK those are not my words, i heard it from my friends I used to jam with)
3. Maybe exploring other artists, or even other genres can help sometimes.
4. Learning new techniques also helped me. I still remember, when I first learnt bending, I was so excited to use it in my playing. It brought a lot of changes over the years.
5. The only goal of being creative should be expressing yourself. Not to be different from everyone out there. There is a difference.
6. I tried covering solos and riffs from guitarists of different genres. Often I failed miserably. But I learnt new licks, scales or some little new snippets which helped me break out of the monotony.
7. Trying different scales helped me. Once, I was just stuck in major and minor scales. The day I learnt a blues scale, someone told me to do a solo over it. That was the hardest thing then for me. Now, I am at least more comfortable in playing along a blues scale than that day. ( Though i haven’t been that lucky with jazz scales, another reason why I admire Syn more)
8. often it helps taking a break from guitar altogether. I know it was hard for me when I did not play for entire week. But it was a refreshing thing from a creative point of view.
This is something I face everyday. Being creative is a slow process and you need to be patient. But i see it has already started for you as you just put this post here. I hope this helps you. Good luck.