go to
simplesciencefitness.com . There's a calculator for your BMR, do that to figure out your calorie in take daily. What time do you work? Do you think getting to work before work start and workout at the gym there early an option? (I wake up around 4 and get my workout in from 5-6/6:30). If that's possible, you can try a PPLx2 , PHUL routine for weight/resistance training. Layne Norton PHUL's great as well
Link here.
As other had mentioned above, the more muscle mass you have, the more calories your body will need to maintain at that level. What is your BF% ? Age? Height? You might need a body re-composition if you've been eatting below maintenance level for a while (look up Reverse diet). With the right diet and right workout routine, It'll take anywhere from 4-6 months to do so...After that shred then you can slow bulk, shred and slow bulk, shred. Repeat. Sometimes it might take even longer at a year for you to get back to regular metabolic rate. It's a long journey as a natty so don't give up too early. Don't buy into those clients transformation/proweight-lifter transformation that you see floating around the net. A lot of them are on PEDs (even ones who competes) and their cycle is around 8-10 weeks which is why you see such a dramatic transformation (none of them will talk or mention bout it cuz it'll be like they cheat/losing trust of clients, sort of a taboo thing to say) There's a lot of dark things inside the fitness industry.
So figure out your daily calories, macro-nutrients, then pick a program and stick to it. Records everything. Then reflect every 2 weeks, see if there's anything that need to be change/alter. You have to listen to your body too, noone know your body better than you. Progress will be made in time, you just have plan it out and follow it.