Start with 200 push ups per day every day and add 100 pushups every week. Don't forget to eat more protein and use one day of the week as a rest day, also try variations of pushups... Decline pushups, inclined pushups, archer pushups, handstand pushups, pike pushups and Hindu pushups. If u have access to bars, pull up is a great exercise. Also planks are good... What else... Ofc there's squat, never skip leg day😂