Only 9 Ways To Get Free Traffic To Your Website

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Hello everyone,
This is my first post on this forum and I am looking for help already.
I have a dedicated hosting account at HostGator and I am hosting 16 Wordpress websites on that server. Frankly 8 of them have a very high traffic load and for the last month I am getting "database connection" errors about 3 or 4 hours a day.
I simply edited the Wordpress themes, disabled and removed all the useless plugins I may but nothing helped. I have some plugins for SEO and they rely on cron jobs but I need them to continue the traffic.
I have contacted the support, opened tickets and nothing changed. After a month's research they told me that Google Bot connections make a high load on the server and gave no solution.
I have some questions and I am open to your ideas really.
Thank you for your help by now.[*]Can you recommend a reliable and fast dedicated server which will solve my problem?[*]Hosting on a litespeed server is better or not? If yes is there a litespeed dedicated hosting service that you can recommend?