I havnt used Signal,but I can vouch for Telegram being very secure. Just read up on how Russia has been trying to block millions of IP addresses latelyin an attempt to block Telegram.
I used to also use a VPN ( that I setup myself on a vps), just know that a VPN is just layer of security and sometimes on some networks,Vpn's will be blocked.

I would recomend that you use more than one browser instead of using Epic privacy browser. Often when people analyse network data on corporate networks they look for people that stand out. Using a normal browser like Chrome or Firefox makes you look more like a normal user. Have a look at this project which shows you how unique your browser and set of browser plugins are,in other words it shows how easy it is to identify you by looking at your browser fingerprint:
https://panopticlick.eff.org