Sometimes when I learn something I have trouble remembering it. You?
Not the only one I have trouble remembering a lot too, even just simple words.
Hebrew is very different than English. Try making a short video with those words you need to strengthen- having a picture + English and Hebrew writing + sound. You can make it on websites\apps like Memrise (I don't know if Tiny Cards have that options). You can also search Youtube for ready made videos. My advice to you once you have a few videoclips (or app cards) ready - no rush: remember you are, I assume, doing it for fun. Do you use the bus? train? take those 10-15 minutes every morning and just watch each video for one week, two if you need to. Remember, no pressure.
The Memrise course one of the mods made is enormously helpful in this regard - I highly recommend it.
I also recommend learning the cursive alphabet and writing words out by hand. In my experience (and especially when a different script is involved), there's huge value in this.