i can not running node or relay , as it need to have my computer running 24/7 , the best solutions for me is to use subscription based nostr service like Primal to support them .
Discussion
If you just want a basic node to send and validate transactions it doesn't need to be online 24/7. You can just get an SSD and intall bitcoin core via your desktop PC. You will need sync the chain every time you start the app, but you can do that in the background.
Why not?
Cheap old laptop can be acquired basically anywhere for less than $140. Built-in battery backup and because it's a laptop you can run it on solar perpetually due to its meager power draw 🤓