Hams stretching. Hot Fomentation.

You don't need any therapist.  You can also self improvement ..like that wait bearing exercise.. (leg raises,  specially use theraband and then start against resistance exercise, maintain your gate you can also see youtube vdo for gate training and then after few week get improvement.. Thank you

Muscular problems seems so visit physiotherapy centre

Need to know more about it, how it started when it started, is it the entire limb or some compartment..? Is there any pain or numbness ?

Is it the whole limb you can't lift or any particular part of the limb Any history of trauma to the leg? A video of your gait would help us know

Weak hip muscles causes this type of problem so strengthening you hip and core muscles will help you Try doing lumbar twist stretch and lunging hip flexor stretch you can see these stretches on you tube. But you also need a strengthening program. Hot fermentation will help to relax your stiff muscles so apply wherever you feel necessary.

Consult your near physiotherapy centre u need proper assisment

https://youtu.be/tfQ94EgpbKo first do these exercises for a week. Then start sqattong for sometime . it may be both stiffness and weekness.