Finally I met someone with same issues as mine. Well brother i reduced the clutch free play to 4-5 mm, and I make it sure that I grasp the clutch lever completely and then shift, furthermore I also observe rpm and shift the gear when it not to early as well as not too late.
I hope oil change also affects the clutch performance, so lets hope an improvement after the oil change. after 300 kilometers, I'll pour zic 10w-40, and after 1000 kilometers, I'll go for liquimoly 10w-40 subject to availability, 20w-50 other wise.