Have guest parking problem with one unit

Hi all,
So here is our problem......
We are a single family 980 sqft units 22 in all. Each unit gets 3 spots garage,driveway & infront of unit.
Guest parking is 11 spaces total.

We have one unit that has 3 cars but doesnt use their garage and we fine them and fine them ....they just pay it.
but now the problem is arising that they weekly are filling the guest parking 7 to 11 cars on the weekends. Stating it family gathering and dinners.
Guest parking has been first come first serve with no resident or guest parking over 48 hours.
this is causing huge problems with the other resident since there is no parking for their guests.
How do we enforce or change our bylaws to fix this problem. They even joke about having a parking ticket jar when they have texas holdem parties.

need advice
thanks so much

Before fining for amount of cars, your docs should be explicit in how each car should be parked prior to using outside parking, re: 2 in garage, before three space is used. In regards to guest parking, each unit is assigned one guest pass. No more than one can be used at any given time, more than they will be fined and possibly towed.

I'm with AugustinD. Increase the amount of the fines. The purpose of a fine is to gain compliance, not to punish. There's ample evidence for you to determine that the current amounts aren't enough to gain compliance.