Awesome job on all of the practicing! Yes, bread making is a true art that requires plenty of practice. The learning never ends really.
The crispy crust is the nature of this formula and type of bread. It should be crunchy on the outside and soft on the inside and it sounds like you are doing a fine job in attaining this! When the bread comes out of the oven it will be crispy; but, as it sits, it will become soft and even leathery from the moisture in the air (and from the fact that it starts to stale the moment it is taken out of the oven). The structure of bread changes as it sits/ages.
For this particular formula, you can't really get a soft crust. Softer crusts are generally created by using formulas that have added ingredients which enrich the dough, such as eggs, milk, butter, oil, etc. You could play around with this formula and substitute whole milk for water. Enriching dough, however, is a completely different lesson and it is so large that it can't be covered properly in the context of a forum. Down the road we will get to Enriched Breads, but there are other fundamental culinary techniques (and some basic baking techniques) that need to be covered first in the basic curriculum.
An example of a soft, enriched bread is
this one. I made it over the weekend and filled it with apricot jam and walnuts. It was delicious! You could try this out, keep it completely plain and shape it however you like. Cheers!