Small UK marketing agency - Needs help with hosting solution

Not sure what we need, but we definitely need some assistance with our current hosting set up. We have 2 hosting accounts that we will be amalgamating over the next few months over time - Both with Siteground. One is a GoGeek account ([login to view URL]), the other is a Entry Cloud account ([login to view URL]) We got the Cloud account hoping to be able to grow everything into, but have been reluctant to move it so far because we keep hitting CPU limits. There is a bunch of Wordpress sites on both accounts, I have disabled heartbeats, set various levels of caching up to try reduce the levels we are hitting, blocked certain bots in the htaccess file, & set up a cron job for 1 of the sites. However, I still don't feel confident & need help from someone with the right experience. We also need to set up packages within the WHM, we need 3 options for both web hosting & ecommerce web hosting. Looking for advice across the board, happy to look at different hosting solutions if there is a benefit. Thanks &