There is a way, many projects simply issue tokens in parts, so that there is no further price drop, and the remainder is simply burned, so the most correct decision
Burning tokens brings its result, it's a good idea.
Yes, this is a common standard practice for any normal project that respects its investors. The amount of tokens that were not sold at the ICO or IEO just needs to be burned, otherwise the price just drops to the bottom and then it is practically impossible to change this situation.