I hope I didn't make a mistake buying a raspberry to install home assistant

Good evening, I am new to the forum and I hope I can help myself as I hope I can help someone in the future.
At the moment I have the lights in my house working with esp8266, IFTTT and ada fruit. This system really works very well, but I decided to go a step further and buy a raspberry 4 of 8 gb he install home hassio but for the moment I see that it was a waste of money since this brings me more problems than benefits:

I am doing tests with switches generated with mqtt and they work fine but I cannot replace the installed devices since in the tests home hassio restarts frequently and sometimes it does not start again I am using Nabu Casa and on top of that I am paying for a service they keep getting messages error (may be due to lack of experience but after much reading I did not find a solution)

Request for https://homegraph.googleapis.com/v1/devices:requestSync failed: 403

Snitun server connection problem
Registrar: hass_nabucasa.remote
Source: /usr/local/lib/python3.9/site-packages/hass_nabucasa/remote.py:323

Challenge / Response Error with SniTun Server
Registrar: snitun.client.client_peer
Source: /usr/local/lib/python3.9/site-packages/snitun/client/client_peer.py:84

I do not know if these errors are part of the loss of connection but I cannot find a solution to this nor can I find a solution to enter from outside the network with the address provided by Nabu casa.
I hope I don’t have to continue with adafruit and have to use the raspberry as a gaming one.

I hope answers, thank you very much

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