Somehow using VPN makes me feel safe while working with cryptocurrencies, like transactions, payments and buying bitcoins.
It may increase your perceived level of security, but doesn't help you at all.
Using a VPN makes it not more secure. Not even slightly.
With a VPN, you are simply shifting the trust from your ISP to your VPN provider. That's all. Security-wise there is no difference.
I haven't really tried other VPN's though for I don't want to risk my wallet just to try other VPN.
You can try any VPN you want. You are only giving away your privacy. Your wallet is not more or less secure based on which VPN provider (or if any at all) you use.
The largest risk with cryptocurrency is that online exchanges are vulnerable, as mentioned, to hacking they say. I know some may already experienced this kind of problem, and I wonder how you manage to solve this.
Definitely not by using a VPN since they don't help you.
Its mostly some simple things like using different passwords, not downloading tons of free software just because it's free, not downloading cracked software, using specific chosen browser addons (and only these few security-related), using 2FA (and actually on a second device!), etc..
You will be fine following these few relatively simple things.