Existing building: Renovation with KfW 55 reasonably possible?

I have here an energy certificate that is about 6 years old and wonder whether the house can be renovated to meet what today would correspond to KfW 55.

Object
Primary energy: 52.76 kWh/m2a (gas)
Final energy: 44.53 kWh/m2a
H'T: 0.214 W/m2K

Reference
Primary energy: 77.88 kWh/m2a
H'T: 0.327 W/m2K

If I calculate correctly, this would result in the following requirements for KfW 55:

Primary energy: 42.83
H'T: 0.23

I should be able to reduce the primary energy with a heat pump + photovoltaic system and thus achieve KfW 55 without further insulation, or is it not that simple? Have the values of the reference building become "invalid" after 6 years?

I have here an energy performance certificate that is about 6 years old and I wonder whether the house can be renovated to what would correspond to today's KfW 55 standard.

The age and the construction of the house would be more interesting to know in this context. Unfortunately, many questioners forget that the community has no key to their crystal ball. Tell us more, that increases the hit rate of the given advice!

Construction began in 2015 in Massiv Bau

Construction began in 2015 using solid construction

That is probably too young for a subsidized upgrade of an old building to EH55, I would suspect. And too late for a subsequent subsidy of a new building. In addition, it did not yet meet this standard when it could have been subsidized as KfW55. I do not consider it generally an economically sensible idea to energetically renovate an eight-year-old house, nor specifically under the aspect that any subsidy measures would be worthwhile here.

That is probably too young for a subsidized upgrade of an old building to EH55, I would suspect. And too late for a subsequent subsidy of a new building. Moreover, during the time it could have been subsidized as KfW55, it had not yet met this standard. I do not consider it economically sensible to energetically renovate an eight-year-old house in general, nor specifically from the perspective that potential subsidies would be worthwhile here.

I am primarily concerned with maintaining the value. There is increasingly strong demand for KfW 55 or better, and poorer houses lose value drastically. I intend to buy a heat pump anyway. I had only hoped to raise the classification on paper with some number tricks and little effort.

Don't let various panic articles drive you crazy. A house from 2015 is very efficient, whether with gas or heat pump. A conversion to a heat pump is usually possible without problems in such houses. Therefore, there is no reason for prices to fall here. Prices tend to fall more for the 300 kWh/sqm houses from the 70s.