Hi Sophia
As I probably said eons further back in the thread I strongly recommend practising the LH on its own; a lot! Get that LH 12 bar form down so you can do it without thinking about it. It won't happen overnight, it took me a long time, but surprisingly suddenly you'll realise you no longer have to think about your LH. It's like its on auto pilot. When this happens it will free up your RH to improvise.
For that reason I'd also advise you to practise the blues scale in RH alone, very robotically (to start with) if required, as well. Forget what is written in the course and start playing the scale C Eb F F# G Bb C. Experiment with it! You really can't hit any wrong notes if you stick to those notes. Virtually any order will work. That way you will start to find things yourself. Play them in groups of 2 or 3, slide from one to the other. Again almost anything will work. A bonus note for the blues scale is E (natural) and sliding from Eb to E gives you one of the classic sounds in the blues. Minor 3rd to major 3rd.
You really can't go wrong, after that it's all about rhythm!
Hope that helps.
Cheers
Simon
All round average Jazz, Blues & Rock player.
Currently working towards ABRSM grade 8.