Not sure what to advise. Could you elaborate a little more on the specific issues your having?
Is your bike set up correctly for you? Are all the components of good working order? Is your health good? Are you wearing the right equipment. Are you riding at the right times?
Just ride it harder..............heh heh....... or get a bike fit, or use some of the guides on line...although I've used Bernard Hinault's book to set my bikes up... a long time ago... I also have very old bikes !