@dawn16 I completely concur: go to the doctor and get a full bloodwork, to include thyroid hormones and testosterone, urea and uric acid (to make sure you can take the additional red meats, or rather fish and chicken to protect your kidneys and avoid gout).
I would say that based on that you can increase significantly the protein intake.
One way to help you increase muscle mass is by lifting, with a good consistent routine that includes all muscle groups and high and low weights to gain strength and volume. Focus on the foundation first: core, shoulders and legs. This will reduce the chance of injuries.
Also: don’t be shy on consuming the beef fat: it not only satisfies your appetite and makes the meat taste better: it provides the raw ingredients for your hormones and brain tissue.
Once you start gaining muscles and working out at a higher and higher level, testosterone production will increase, and the gains afterwards are exponential.
Remember to start slow and lift your own weights (don’t pay attention to what others are lifting and compare yourself): you are on your own journey, but can share it with a workout buddy who will help you keep it consistent and constant.
Be patient and start with 80-80: lift up to a max of 80% of the weight you can lift, and only do 80% of the reps you think you can pull. The idea is to avoid injuries or excessive lactic acid that will make you stop working out.
Be patient and work no less than 3 days a week, and no more than 4. Leave at least one day to recover.
Workout intensely between 45 minutes to 1 hour, but not more than that: after an hour your body thinks that you are in trouble and will start generating cortisone, which will inhibit the testosterone and will eat away your muscles (the reason why most marathon runners look like they are about to die).