There's not much wrong (well, nothing at all, really...) with any of that, neither the video nor the Soundcloud. I've played with numerous front-line folks that couldn't hold down a rhythm like that (I play drums...). What do do to improve..? You just need to widen a little your 'palette', and I'd suggest that one way would be to listen to some others, to soak in some of their rhythms. Who, for instance..? Joan Armatrading springs to mind as an excellent 'strummer'. Maybe U2's 'The Edge'..? For enthusiasm and stamina, Ritchie Havens is as good as they come. Chrissie Hynde (The Pretenders...), maybe, or Johnny Marr..?
A tip, that may be useful... It's not necessary to play all the 6 strings all of the time. A lot can be done with brushing only the bottom 4, or the top 4; bouts of arpeggio are good, too (picking individual notes out in rhythmic fashion.
Try some of this stuff; see how you get on. The essentials, you have already, with good timing (singing at the same time, too; very good, lad; very good..!). You're doing fine, so carry on.
Oh yes; the most important bit... Be natural (as in the video...). If you feel it's right, then it's right.
Hope this helps.
Douglas