Selfhosted

I hate to be that guy but I think that you should persevere and try to resolve the issue instead of paying someone. I suggest using a large language model to troubleshoot existing problems. For every three or four easy-to-run containers, there are usually one to two shitstorms lacking proper/ easy to follow documentation but that doesn't mean the end result isn't worth the effort. If I recall correctly I also have issues with wallabag but eventually got it to run.

Alternatively you can use something like link Warden or obsidian to self-host.

Depending on how much you want to donate, you could also pay for a server somewhere. For example Hetzner hosting starts pretty cheap. That way you can self-host without having to host it on a physical machine.

I know your question is regarding hosted options, but how were you trying to self-host Wallabag? I do it with Docker Compose and SQLite. It's a very simple setup (see below) based on their example at https://github.com/wallabag/docker?tab=readme-ov-file#docker-compose.

services:
  wallabag:
    image: wallabag/wallabag
    restart: unless-stopped
    environment:
      - SYMFONY__ENV__DOMAIN_NAME=https://wallabag.example.com
    ports:
      - XXXX:80  # replace with an open port
    volumes:
      - ./data:/var/www/wallabag/data
      - ./images:/var/www/wallabag/web/assets/images
    healthcheck:
      test: ["CMD", "wget" ,"--no-verbose", "--tries=1", "--spider", "http://localhost"]
      interval: 1m
      timeout: 3s

If you're not self-hosting anything yet, I suggest learning Docker Compose and Caddy. It makes setup of new services really easy.

Alternatively, you could try something like Yunohost that handles this for you but replaces your OS.

Seems they offer a hosted version for less than $1/mo.

If you're talking generally about other services, it varies widely in what you're going host. Will the host charge for traffic or storage? If so, be very careful about what you host.

If you just want something to kick around DigitalOcean has decent free-tier stuff and it is pretty simple for beginners.