Is it possible to setup page level 301 redirects without hosting

I have 5 websites I merged into one years back and each site has 10-15 page level redirects that have been done via .htaccess but this takes up 6 domain slots total on my hosting account that limits me to 20 domains.

Does anybody know if there is a way to set these page level 301 redirects up some other way so that I can open up those slots in my hosting account and avoid upgrading to a more expensive plan.

Thanks guys!

I'm confused about the "5 websites merged into one" part. Like, how many websites (well, domains) do you actually have? One, or six?

Because if it's only 1, you can use plugins (the Pretty Links plugin for example can do this, and it's free). But you need Wordpress for the plugins to work, I'm not sure how other CMS platforms are handling this

There is a domain name forwarding can be provided by domain name registrar.
Would that be helpful for you?

you should try CloudFlare, there you can setup 301 redirect rules