Sorry to disappoint you but your tv won’t be receiving any updates.
As for smart tv updates and blaming LG that it has stopped providing updates, its the same with every manufacturer. Even android tvs stop getting updates in 2-3 years.
Its always better to buy an external device for this purpose. They last longer and can be upgraded when needed. Buy a firestick or an apple tv whichever suits you. There are many more options. Firestick is just 2000 INR.
Does your android phone receive updates for more than 3 years? No, however expensive it may be. Its the same case here.
I am not defending LG just providing the solution and wanting you to accept the reality.