They sell foam wedges on Amazon that you can put under your futon to create an incline.
I got my BR 1 year ago now. I bought this wedge pillow and I’m still using it 😊
Back Bed Wedge - Clinical Therapeutic Grade Incline Sleeping Wedge Pillow - Acid Reflux GERD Reliever, Pain Relief, Snoring Reducer, Pregnancy https://www.amazon.ca/dp/B01F6CQ082/ref=cm_sw_r_cp_apip_fEXbjuz9KFmvF
Could you show me which incline pillow you use? I'm looking at this one which has a 30 degree incline: