Nicely placed hi-hat (rolls), 808 decays too quickly and is too dry in my opinion so I would change it and either swap through other samples or use some processing (increasing the release with transient shapers for example). On the other hand the kicks you used in the end of the bars work good. Fine idea with the panned cowbells. I think you can also check the arrangement if one more fix element (maybe additional layer to the main theme) can make the beat sound even bigger.
If you'd like to check my beats and let me know what do you think about them, feel free to reach my signature, I would be happy to get some feedback on them.
