I can get your site moved over to Cloudflare, which offers protection against automated attacks.
If the site is on a VPS/Dedicated server, then I can install an active firewall to ban malicious bots.
Relevant Skills and Experience
I run a web hosting service and have extensive server security experience.
Proposed Milestones
$25 USD - Site on CF, with should greatly reduce bot traffic.
Additional Services Offered
$60 USD - If VPS/Dedicated, implement active firewall and Modsecurity(if supported by server).