How much can you hook up on a 30 amp circuit This mobile home being remodeled is hooked up to 30 amp circuit. It is a 21 w kitchen and living room. Currently there are only 4 20am breakers?

There are only 4, 20 amp breakers supporting the whole house. The plan is hooking up properly the home a breaker to each room, GFCI to the bathroom and kitchen area, and separate circuits for lights. The question is how much is too much? The breaker box can not be increased in AMPS so 30 is the limit.