My ISP doesn't give a Public IP and let me open ports without paying a extra fee, which I cannot afford rn.
I host all my services on a old PC, Anyways that i can access my services beyond my LAN?
ultimately, you will need some kind of access to something with at least one port open, if you intend to host services on the clearnet. you could use tor if onion services will work for you. if you have ssh access somewhere with a port open (or a friendly sysadmin), you could tunnel to there and redirect incoming connections back through the tunnel. same thing with a VPN, if the sysadmin is really friendly.
Use tailscale as it is easy to setup, and just with 1 or 2 commands you can have it setup to forward subnets (which can let you use the same local IPs remotely to connect back, instead of Tailscale assigned once) and Exit Node (route all your internet traffic from your Home connection when you are on public network and enable exit note on client)