what you're describing is often called a content management system, or CMS. if you're searching the web for more options, "CMS" is a useful term to include in your searches!
both options above would require you to move to a different host, but if you want to keep your site on neocities, maybe something like
publii would work well for you? instead of setting up a web server that you log into, it's a program you run on your computer to generate site files that you can then upload to a static host like neocities. so i guess you could call it a static site generator, or SSG, but it's different from every other SSG i've seen because those still have you writing the all files in your code editor, where this gives you more of a word document-like post editor, which i think is what you want. another useful term to search for this kind of thing is WYSIWYG, which stands for "what you see is what you get". unfortunately with publii, all the existing themes look pretty corporate, and i have no idea how hard it is to make a new one that looks more fun. i haven't tried it myself; i just think it's interesting!