Based on what?
Let's look at the graph again, that compares actual deaths to what you say would have happened.
What is it that makes you believe that there would have been a sudden and sharp increase in deaths?
Your graph is just made up nonsense.
Let's instead look at actual numbers
The worldometer says we have
683,118,566 confirmed cases and 6,824,700 deaths
This is almost exactly 1% of confirmed case are deaths.
This is very crude and has flaws because
1. Not all infections are confirmed
2. Not all deaths are confirmed to be related to/caused by Covid
3. Some Covid deaths would have been deaths anyway, but were attributed to Covid
4. Doesn't take into account the vaccine status.
But as a crude overall value here we have a 1% death rate.
Now rather than looking at the entire world, lets narrow down on 1st world countries where we trust they have a good testing program and ability to track infections and deaths and are less likely to lie.
USA at just above (1.09%)
106,082,759 confirmed cases
1,153,526 Covid deaths
UK (0.85%)
24,423,396 confirmed
208,458 deaths
Sweden (0.88)
2,701,192 confirmed
23,823 deaths
Denmark (0.26)
3,177,438 confirmed
8,344 deaths
Finland (0.62)
1,465,256 confirmed
9,028 deaths
Australia (0.17)
11,301,219 confirmed
19,760 deaths
New Zealand (0.18)
2,250,952 confirmed
3,966 deaths
As you can see, countries that did well at controlling the spread in the early days (before vaccine) did significantly better than countries that had a poor Covid response.
Countries that held off the outbreak to get their population vaccinated were able to achieve a 0.17% deathrate where countries that did poorly got around a 0.8 to 1% deathrate of those confirmed infected.
Here is an article which tries to account for the undercounting of infections and undercounting of Covid deaths in NY
Case Fatality Rate (CFR), Infection Fatality Rate (IFR), and Crude Mortality Rate (CMR) latest estimates for the COVID-19 disease from the SARS-CoV-2 virus originating from Wuhan, China
www.worldometers.info
They conclude a 1.4% death rate of those infected.
As we know (in a previous post I showed the deathrates by vaccine status), unvaccinated people have around 10x more likelihood of death by Covid than people that are fully vaccinated.
And in these wealthy developed countries the majority of people catching and dying of the disease are vaccinated people (because these countries got the majority of their population vaccinated before the disease spread to them)
The unvaccinated are going to have a deathrate somewhere in the vicinity of the 1-1.4% and the vaccinated are going to have a deathrate somewhere in the vicinity of the 0.1-0.18%