Start by removing the sad little pointy portico. That's not MCM at all and looks like an afterthought. Will you actually sit in the front yard? Often patios get the heaviest usage in the back and near the kitchen door for easy cookouts, etc. Here's some inspiration.

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https://www.houzz.com/photos/query/coastal-mid-century-exterior/nqrwns/p/20?oq=coastal%20mid%20century%20exterior&redirectoq=coastal%20mid%20century%20exterior

You need professional, local design help and a good budget. Changing the entry porch as well as how the house approaches the street will make or break this house. Probably a architect/designer with a good working relationship with a landscape architect.

You live by the coast how fun! That means you've got a lot of leeway to not have to be so strictly formal.

I'm real big right now on bright white marble gravel rock for MCM homes. It is a material that was popular in that era and very retro. Lay out some nice curvey bender board for a good big sized seating area and big round low table, lay some weed cloth first and fill it with the white stone and coastal accents.

Hang a big round white paper lantern light or two inside the porch to draw the eye in. Paint the white triangle gray as the house. That may be all this cute house needs. Please don't apologize for your home. It looks great and will show real pride of ownership. Wait till your yard goes in...wow!

Not all of these examples use the white rock. Some sandy areas would be nice, too as in last photo.

With all that dirt you could put in a planting mound along the street for a sense of privacy.

Love that boardwalk in the first photo. Find a place to put one in, even a few lined up driftwood logs or weathered boards on the ground. It's all about leading the eye. Have some fun, you're at the coast! (And Happy Birthday!)

Wouldn't these look good on sand? It's a coastal decor. It doesn't have to be functional or go anywhere, Just to lead the eye to another feature. Size to the scale of the yard. This looks a little big, it shouldn't be the main act. I got it... think Japanese Tea Garden, everthing at ground level is diminutive. A few boards instead of the bridge.

Thank you everyone.  All very creative and great ideas!   I like the idea of painting the entry gray until we can get an architect to work out the entryway... The solution seems obvious, but $$$.