In your case, as long as the root is still there, it will be easy.
The tooth decay is so serious that if the teeth are simply filled, because the tooth wall is already very thin, the teeth will easily burst when biting big bones or hard things in the future, so full crown restoration is needed.
Full crown restoration, in the case of tooth decay like yours, there is only one possibility for a doctor to do full crown restoration for you, that is, first fill up the place where you lost your tooth, then go to the hospital to help you grind down the whole tooth in a week or so, then make a dental model, and then help you put the crown in a week or so.
As for piling or not, a conscientious doctor will give you advice according to your teeth. This kind of piling is equivalent to putting some small claws on your teeth, which makes the combination between the newly made crown and the original teeth more stable. You can also refuse piling, depending on what material you choose for porcelain teeth. Piling is expensive. Piling+porcelain making, without 2000, it should not come down, and the cost of piling alone is more than 800.
Remember, everything is easy as long as it is rooted.
Your original tooth is only half left now. If it is not piled up, it is estimated to be unstable, because it is only half, the contact surface is too small, and the force is uneven. If you don't pile it, it will be terrible. Even if the pile is driven, it is necessary to consider that a small part left in the future will be unbearable and break. See what doctors can do, and register with those attending doctors, preferably experts in dental plastic surgery. Different doctors are good at different things, you can look at the resume introduction of hospital dentistry.
If the money is not bad, just hang an expert clinic.