Nice question, here are some guides for doing that on that level.
1. CRAWL YOUR SITE
When you redesign your website, there’s a good chance that URLs will change. If URLs change, you absolutely have to inform the engines where those older URLs have moved to. If you don’t, you can destroy your SEO power. All of the equity those old URLs have built up can be wiped out. And when that happens, your rankings drop, organic search traffic drops, sales drop, revenue drops, and heads roll. That’s why understanding all of your current URLs is critically important.
The good news is that there are several ways to understand your current URLs. I highly recommend you crawl your own site, which can reveal many of your current URLs.
2. Perform an Inbound Link Analysis
Inbound links are incredibly important for building SEO power. And, there’s a huge risk in losing those powerful inbound links if you change your URL structure. I highly recommend performing an inbound link analysis to fully understand your link profile. Know the pages linking to you, and where they are linking. Then make sure your developers understand that those pages must be migrated. And make sure you utilize 301 redirects when pointing your old URLs to your new ones. More on 301’s in the next section of this post. There are several tools you can use to perform an inbound link analysis, including Open Site Explorer and Majestic SEO Tools. Get familiar with them, and don’t skip this step during a redesign or migration.
3. The 301 Redirection plan
This is the heart of your migration from an SEO standpoint. If there is one thing you need to get right during the redesign, it’s this step. As I’ve explained already, you need to make sure all of your older pages 301 redirect to their newer counterparts. 301 redirects will safely pass PageRank from your older pages to the newer ones, and will enable you to maintain your Search Equity. If you fail at this stage, your trending could very well look like the graphs I included earlier. Don’t botch the 301 redirection plan.
4. Analyze Site Reporting
When redesigning or migrating your website, you should absolutely analyze your current site reporting. Specifically, you can focus on the top content, landing pages, and referring sites reports. They will help you gain a solid understanding of which pages are visited most, which are the top landing pages, and which pages are receiving the most referring traffic. And by the way, if you have landing pages receiving referring traffic, then that means there are external links pointing to those pages.
5. Don’t Drop Optimization During the Redesign or Migration
Imagine you have 500 pages of optimized content on your current website. You have strong rankings and traffic, and life is good. Then you redesign your site, and drop most of your on-page optimization when the redesign is launched. Needless to say, your rankings and traffic could suffer greatly. I wish this was rare, but it’s not. Many times, marketers don’t understand the power of on-page optimization, keyword research performed in the past, uniquely optimized pages, etc. Then the new pages either have the same general optimization across the site, or a scaled down version.