Hello,

My answers inline, bolded:

1- Home Page: the main msg on top is too close to the logo, can we increase the spacing? 

in general, to bring down the title you can use

#hero.has-image .hero-title-wrapper {
    margin-bottom: 100px;
}

in customizer -> additional CSS. to bring it down more, decrease the value for margin bottom

2-Home Page: the showcases hero images focus on the middle of each image, is it possible to edit the focus area?

The style background cover applied to the image means that the image is centered in the current viewport

 Home Page: from where can we change this default msg: (Awareded international digital studio)

That's the caption of the parallax image you can change it the block's settings (Gutenberg) or Elementor (widget)

4- Showcase: What is the recommended hero image size? it's getting cropped. or can we change the cropping options?  

the image is getting cropped according to this process

https://clapat.ticksy.com/article/7379

so the original aspect ratio according to the current viewport size

5- About our studio page: the hero image is not showing and I can't find where to change it. + other content I can't find from where to edit/change

you should change it in hero options and if you still having problems send us wp admin access so we can verify

https://prnt.sc/lUxj5gTTW4-V

Can you advise which page could be the best to work on as a services page?

It's a combination of About and Contact demo pages. It can be done because contact form, map and contact icon boxes are actually blocks that you can move around

Page about: Can we adjust the arrangement of the clients' logos? need to add more / less spacing / smaller whole space

The size of the client logos is defined by this CSS:

.clients-table li {
    display: block;
    float: left;
    width: 20%;
    min-height: 30px;
    border: 1px solid #ddd;
    box-sizing: border-box;
    text-align: center;
    margin: 0px;
    margin-left: 0px;
    margin-left: -1px;
    margin-top: -1px;
    padding: 15px;
}

so as you can see the width is 1/5 of the space with a bit of padding (15px)

you can modify the values as you wish and then ass the code to customizer -> additional CSS

- Same page: Hero image is not showing unless I scroll down. 

The hero image is displayed by default under the hero caption but it is visible before even scrolling https://prnt.sc/lUxj5gTTW4-V

- Same page: can I edit the size of the team member photos? I replace the team photos with services icons

Make them smaller or bigger? you can modify the height for instance of the panel image with

#team-panels .panel-content-wrapper {
    height: 40%;   
}

Hi sure, what kind of help do you need? We've already answered to your set of questions

Hello,

That really depends. As you imagine, we are very tight with time - ThemeForest is a competitive market. We can help you with small custom work if it comes to it, but otherwise for extensive full theme implementation it may get expensive.

And full theme implementation does it mean just editing the content. Or something more complex.