This performance shows fine progress, strumming and singing-wise. And it looks like you are having fun at it, too

Not that my own level of playing is great, but I do think that the following approach would allow you to enjoy playing this even more:
Since you have pretty much got the strumming and rhythm, you can now concentrate more on which strings you are hitting.
I found it quite liberating to realize that it isn't necessary to hit all six strings for every strum.
For example, maybe leave a few bottom strings out, then a few top strings out.
Also, it took me a long time to grok that some chords don't involve all six strings, anyway.
And after that, a hammer-on here and there on bass notes would send you right over the top.
Keep going, this is nice !
Pierre