I lost traffic from my website and the rankings also gone down... What should I do?

[HuptechWebseo]

I've started working on a project recently (for 20 days) and it got average 1800 visitors per day and the ranking were seemed good. When I started that project, I saw that there were too many plugins installed. I removed unnecessary plugins and keep the importance ones. And I started modify some pages considering SEO perspective. Few days ago I created a backlink in reddit; from where I got way too much traffic in the site at the time and the server gone down. So I have to change the server. Now I see the drastic drop down in both ranking and the traffic.

I am wondering if the ranking affected when I changed the server?

Or

Is there any other way to check why my ranking and traffic gone down?

[TucsonAZWebDesign]

If you moved it with the same url structure and essentially just cloned it over  you shouldn't notice any impact. I recently moved my Wordpress domain with a simple WP Clone plugin over to my VPS and there was 0 change in scores of any sort.

I've noticed the best way to reduce server crashes on Wordpress is to reduce your plugin quantity as much as possible. Granted some themes have a ridiculous amount installed by default, but anything in excessive that you can get rid of is ideal.

I usually try to not at the absolute most exceed 15 plugins, and most of my sites operate with under 5. This greatly lessens the potential crashes, My sites been up about 6 months less than yours and hasn't crashed yet, hopefully my luck streak keeps rolling lol!

[RyanPurkey]

Unpaid plug: WPMU DEV is a good service for Wordpress as well. With their backup, optimization, CDN, and compression tech their annual fee is still below what you'd pay trying to piece together all those services somewhere else. Plus GREAT support.  There used to be a coupon code here in Moz's partner section as well. They might still have a special deal if you ask.

For your situation, you'll want to check to see that your database is still referencing the same URL structure as well (look for things like switching from www to non-www as default or HTTP vs. HTTPS.)

As Sean says, focus on URL structures. If old URLs are working just the same as the ones on the new server, things should be fine.

Do you see any crawl errors in Google Search Console?  That will give you some of the best insights.