You can look for software development agencies that specialize in business software development and have experience working with clients in other countries. Regardless of the approach you choose, it's important to carefully vet any potential candidates or agencies to ensure that they have the necessary skills and experience to meet your friend's needs. This may involve reviewing their portfolios, checking references, and conducting interviews or trial projects.

It sounds like you might be describing wall decals or wallpaper. Wall decals are vinyl or paper stickers that can be easily applied to walls and come in a variety of designs, including personalized drawings. Wallpaper, on the other hand, is a type of wall covering that is applied to walls and comes in a variety of patterns and designs, including custom designs. Both options can be a great way to add personalized decorations to your walls.

I never even thought about that question. I wonder what other people have to say about it.
What app do you use on your phone to calculate discounts in stores? I understand that to find out the original cost you need to multiply the price at a discount by the percentage plus 1?

I suggest you start by optimizing the content of your site to improve the position of articles in queries google. It would also be nice to optimize the advertising to attract the audience. Also, as you said, you can use backlinks on third-party resources that will bring people to your site