Host problems, need host advice

[btra fan]

I am running what I think is a low traffic site. Average 100 members and my site counter says I get about 600 hits a day. I have pictures and videos, maybe between 10-15GB of material.

I have a shared server plan and my host is telling me that i am using high resources not allowed on a shared, about 30% CPU usage and wants me to bring it down to 20%. I have taken down about 40% of the site and still no progress. The host has been shutting my members section down and just recently suspended my account and telling me if it happens again it will permanently suspend my account.

Not sure if I should mention the host's name but I have a shared server and pay $7 a month for what is suppose to be unlimited storage and bandwidth. I never thought about there being a limit on cpu usage.

They recommend I get a dedicated server from them and quoted me at about $500 a month, that's about half my profit and not about to do that.

Any suggestions greatly appreciated.
Thanks