I believe future is for BTC and my investments will mostly on it. I wanna use Electrum as my main btc assets storing. As i heard exchanges is not safe for storing purposes.
Also my plan is to invest after that litle by litle for example from my income to invest 100-200$ in month.
Since you are doing already a regular investment every month for long term, I suggest that you should purchase an open source code hardware wallet to hold your Bitcoin safely since it just cost you as low as hundred bucks compared to the total amount you are saving for long term.
Electrum is safe but there’s a chance that you might get hack unknowingly when you accidentally install an app with malware. Hardware wallet can protect on this kind of potential risk since your coins is safe offline.