If the home is THAT badly constructed, consider the harsh reality that you may have to throw more $$$ into it, than the house is worth.
The foundation/flooring itself may need to be re-built…then the roof has to be replaced….
These are LARGE expenses, and cause major time/mess to put up with. I’m sorry, but maybe moving IS the best option. They are NOT easy fixes if you’re not hiring anyone.
Faron