I have been using WPforo for about 5 years now with no apparent problems, although I had noticed the site seemed to be getting a bit slower.  

The other day my host said I must reduce rows in database as there was over a million, which is their limit.  We did this.

Then, a couple of days ago they said "the account is still using a much higher amount of CPU than most of the accounts on the server with similar traffic, so additional optimization should be done."

I have been trying to look into this and saw that there were far more visitors than I would expect, up to 5.6k some days.  So today I added CloudFlare.

Now I have just received an email from host saying that "the resource usage for this account is not only high, but has increased."   I have no idea why it is increasing.

They say my choices are "to either remove the WPForo plugin or move the account to a proper hosting environment immediately."

It is a non-profit site run as a hobby and there is no way a VPS can be afforded.

Is there anything I can do?