What do you need help with? Is there anything concretely you're concerned about?

Why the cast time? You are making a combat spell (seemingly) but a non combat cast time. Nobody will use this.

@Cubic I am not very experienced and I do not understand if the spell is balanced or not.

@SeriousBri I am thinking about a spell which can be used when you know you are soon going to fight. I was specifically thinking of when you want to invade a city. In a previous version the spell lasted for 1 hour instead of 10 minutes, maybe is better that way?

@Pyrotechnical 2 for the damage I started by checking the damage of Bigby's Hand cast at 9th level and (more or less) increasing the dice. I'd like to have a spell very useful for when you know you are soon going to fight. Regarding the interposing, I was thinking about the player having control of the Hand in response to movement of the enemies, so that you can always positionate it in the most effective way. But maybe is too clunky in this way.

@SanfordBassett thanks for pointing that out. I changed that part to "Buildings and objects in the line take double damage times if the impact surface is at least 50 by 50 feet and do not stop the movement of the hand if they are destroyed as a result of the damage they take from the hand."

A 17 Wizard/ 3 Sorcerer could double the duration for the measly cost of 2 sorcery points.

The first phrase of the Interposing hand has some words to few or to many.

Please take a look at our guidance on how to ask a good homebrew review question. That meta has lots of good info on how to approach and present for a good question here.

@ThomasMarkov Could you please expand your comment? I understand that with the multiclassing it is possible to double the duration of the spell. Is this something that you think would render the spell much more powerful?

@Anagkai In the revision, I'm using the wording provided by Pyrotechnical in his answer. That is much clearer and simpler than what I wrote.

The sorcerer meta magic Extended Spell (available at 3rd level) allows the caster to double the duration of any spell with a duration of 1 minute or longer, which would give your spell a duration of 20 minutes.

@ThomasMarkov I understand that you can double the duration with Extended Spell. What I do not understand is why you point out this.

Please read the meta post linked in NautArch's comment. Follow-ups should be posted as a new question after a few days and playtested first.

@PurpleMonkey I read it and with the revision I did, I tried to make more specific questions and providing more details. Was posting the new version of the spell what I did wrong?

@Knomes Yes, "do not revise your question with feedback from answers"

More specific and detailed is good, but vitally changing the question in response to an answer isn't generally workable for the site, because it invalidates the answer

New version of a piece of homebrew for review should be a new question, (because well, it is a new question) and we ask you to wait at least 72 hours