When will I reapply for a European tourist visa after it has been rejected?

When will I reapply for a European tourist visa after it has been rejected? At any time, if the applicant's visa application is rejected due to incomplete materials, the embassy suggests submitting a new and complete visa application; My classmate was rejected many times and found no problem. Later, I heard that the problem-solving network is good. I tried. I gave it once. This government unit is in charge, and because of this embassy, it has been a special institution for refusing and re-signing visas for many years, but the price is too high and too dark.