Our team has 4 websites as of now. 1 of the websites rank well while the other 3 are not. We are planning to merge all the 3 websites with the 1 website ranking well. Is it a good idea? Does the 3 websites may give a bad effect on the 1 website we have? Do you have any suggestions when it comes to merging 4 websites? Hope to get a feedback. Thanks in advance.