This looks like the best suggestion to avoid many of the occuring issues but don't know how much skills do i need to get it.
Would you please provide some helpful guides/tutorials on how to easy setup my own node? or just explain it here if it's that easy. Thank you
Running a full node might fix issues like these in the future because you'll always be up to date with the full blockchain, but in my opinion you don't need to have a full/pruned blockchain copy to avoid these issues, just stop using old versions and unsupported wallets anymore, and try to store your private keys somewhere safe (using physical copies like paper wallets, or somewhere that can't be accessed online) just in case you suspect you might run into problems like these again in the future.