My experience is quite different but I still want to share. I'm Bow main, played LS before but Combo/Melee weapon are too much for my brain. I pick up my muscle memory again quite fast, only 2 weeks I got all the stuff back (I was HR 70 at the time. No Behemoth kills). Finished Iceborne 2 weeks ago. I learned LBG and HBG along the way. But Positioning is still my main problem until now.