It is common for years to pass with the server left entirely to the firm that built your site. Why not take stock of whether the pricing, configuration, and security still fit where you are now?
Your monthly server bill has an unclear breakdown, and you can’t judge whether the amount is really fair.
You left the whole server to the firm that built your site, so you don’t know whether the current plan matches your site’s scale.
You’re on a higher-tier Xserver, CPI, or Sakura plan, and you suspect you’re overspending on specs you don’t use.
You’ve never had a third party check whether your WAF, SSL, and backups are actually working.
You have a maintenance contract, but when you ask, the only answer is “no problems here,” with no evidence you can confirm.
After the site was delivered, you have no one to consult on operations, updates, and incident response going forward.