Garden slopes downwards away from house - design ideas?

Any garden design ideas please for a garden that slopes away from the house?
Approx. 50 foot wide by 30 foot deep.
Soil likely to be acidic as it's South West Wales (UK).
Gradient is quite steep (perhaps 30 degrees?).
View of garden from house

View of top of the garden close to the house
Plants I tend to go for, but I can adapt to others easily: acers, yucca australis, magnolia, bamboo (gold, niger), wild ferns, all types of ferns, privet, fast growing pine type trees. Any trees I go for need to be prunable to my desired height (so I don't block any views).
Garden style I admire: Japanese (however there are trees on perimeter that will shed leaves in the autumn), rain forest, tropical, beach.
Happy to lose: the lawn as it's not the easiest to mow being so steep
Having searched online, I can see some hard landscaping goes into gardens on a slope. I embrace the fact I will need landscaping too but on the cheap side, without concrete and preferably natural material like wood/railway sleeps.
Approx. 50 foot wide by 30 foot deep.
Soil likely to be acidic as it's South West Wales (UK).
Gradient is quite steep (perhaps 30 degrees?).
View of garden from house

View of top of the garden close to the house

Plants I tend to go for, but I can adapt to others easily: acers, yucca australis, magnolia, bamboo (gold, niger), wild ferns, all types of ferns, privet, fast growing pine type trees. Any trees I go for need to be prunable to my desired height (so I don't block any views).
Garden style I admire: Japanese (however there are trees on perimeter that will shed leaves in the autumn), rain forest, tropical, beach.
Happy to lose: the lawn as it's not the easiest to mow being so steep
Having searched online, I can see some hard landscaping goes into gardens on a slope. I embrace the fact I will need landscaping too but on the cheap side, without concrete and preferably natural material like wood/railway sleeps.
I wish I could garden all year round!
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Not after advice anymore as sale of my house fell through and this house went with it.
Dealing with these kinds of sites can be very expensive if it involves moving large amounts of soil. I had a garden with a big slope down to a stream, mowing the grass was very difficult and physically hard work. I wonder if the forum gardeners were sadly unable to help or make any helpful suggestions? It would have been a difficult area for anyone to garden.
I do hope you find your perfect garden space soon and I hope you don't mind me adding these comments.
Gardening is so exciting I wet my plants.