I would do a lean bulk. That will mean a long-term goal of weight gain (muscle gain while minimizing fat gain). I’d start with a small surplus — 100 to 200 calories more than you are currently eating, and also a bit more protein, closer to 90g.

After a few weeks, reassess. Do you feel adequately fueled for your workouts? Is the scale going up gradually? You’ll probably have to gain a couple pounds of water weight when you start bulking, but after a few weeks, you should see the weight difference from the calorie surplus. If not, increase your intake a bit more, another 100-200 cal.

With such a small change, it will take a while to see if it’s working, so it will be important to be patient and track your weight for a few weeks before making changes. At the same time, you won’t gain a lot of fat suddenly, so it’s super easy to make adjustments down the road. Also, if you do start lifting more often, and eventually with more muscle on your body, expect your TDEE to go up— your bulking calories will go up too, so adjust accordingly. You got this!