回答
This is not a piece of advice to you I'm talking to myself for my practice of writing skills.
what we called 'subjunctive' are often called Unreal Conditional Sentences.
now we'd call 5 conditionals involving it 'conditional sentences'. it'd be a little difficult to grasp all instantly, because of its 4 conditional and combinations of the tense.
I'd introduce comprehensible text-book of conditionals.
:CONDITIONALS: HOW CAN I UNDERSTAND & USE THEM?'
https://www.englishcollege.com/why-use-conditionals-how-many-understand
Present subjunctive
http://us-jp.blogspot.com/2015/01/present-subjunctive.html
thank you for your teaching.
the sentence had been a part of the famous song ' Home, Sweet Home', hadn't it? I've searched on the web and I've noticed it at first.
：Home, Sweet Home
Mid pleasures and palaces though we may roam
Be it ever so humble, there's no place like home!
A charm from the skies seems to hallow us there
Which seek thro' the world, is ne'er met elsewhere.
Home! Home! Sweet, sweet home!
There's no place like home
There's no place like home!
：Home, Sweet Home.
https://bunbun.boo.jp/okera/w_shouka/m_chutou/c22_hanyu_yado2.htm
If it (should) be ever so humble, there is no place like home.
この文では、should が省略されたものと考えられ
Be it ever so humble, there is no place like home.
be it ever so ～ 「どんなに～でも、」の形では、
If I were a bird, I could fly to you. （仮定法過去形）の If が省略されると、倒置されて
Were I a bird, I could fly to you.
となるのと同じように
If it (should) be ever so humble, there is no place like home.
Let it be ever so humble, there is no place like home.
の仮定法現在 が省略されて、倒置が起こっている。
又は、見たまま、 be動詞の命令形 とも考えられる そうです。
This is not a piece of advice to you I'm talking to myself for my practice of writing skills.
please refer to the site. I suppose to try to get the meaning would be useful for your learning more than getting the answer instantly.
Present subjunctive
http://us-jp.blogspot.com/2015/01/present-subjunctive.html