3 days back my website is at 48th page for the keyword search mobile app development in google, today morning i saw my page rank it is at 27th ,but after 8 hours in the evening if i look for my website in google search for keyword mentioned above is at again 48th rank how to improve this ,is am i done anything wrong i just posted my website links to some social networks from morning to evening that't the work  i done only ,when will my site again comes to lowere page rank to 27 or in 20's
My website google page rank increased from page 27th to 48 with in 8 hours?
seo;google search console;pagerank;google ranking