My plane isn’t producing enough lift

Thanks for your responses. I will try them when I have the chance

I'm not sure what your landing gear plan is, but if it's one in front and two in back, move the aft two wheels to only slightly behind the COM to make rotation easier. If it's 2 in front and a tail wheel, make the plane angle nose up by default. I suspect your problem is that it's generating plenty of lift, but it's negative lift and you aren't able to overcome it with your control surfaces.

Make the wings bigger and go faster