Find the problem of the overall server load.

Find the problem of the overall server load. (READ TO THE END)
You may need to optimize the code on the site. Site laravel on OctoberCMS

The problem is that long loads the home page, especially the first time. Sec 20 with the Internet 100mb Further if you switch between pages sec 5-6, which is still a lot.
The site is constantly seated 40-70 users. Its a minute online. Theres 900 people a day.

How did it all start?
Initially, the site stood on the reg.ru sinker normally (3 sec). Given that the site has a lot of images in its original weight (there is no cut in the quality of images, and it should not be), this time was excellent. But the site was blocked every few days. When they applied to unlock, reg.ru replied that the site was blocking the system automatically because there were too many requests to the database. And since the regura blocked us site half a day 2 times a week, it was decided to move the site to a new hosting Hostiq.ua We gave access from the regur that they would look at the site, determine the tariff, and move the site. As a result, the site, which promised to move in 2 hours, did not work normally 2 days, he loaded on the sec 30 page, and those support all threw on the dudos. As a result, we received an answer that their cars will not pull our site. We had to go back to the regar, but the problem with the lock remained. Next, we changed two more hostings, and the download still limps.
But the site is not blocked!!

We need a specialist who can figure out what the problem is. In the code itself, or in hosting.