As a first step, turn on Keep alive in Blokada’s App settings section. In this case, Blokada’s priority will be increased and it can help to stay online; but please note, your system still can effect this behaviour. If you set it, and you still see that Blokada is stopped time after time, check your system’s settings and turn off every battery- and memory-optimisation for Blokada. Unfortunately it is different in every system, therefore please check your phone’s settings or follow the documentation on Don’t Kill My App.
Another option is to enable Always-on VPN. To do it, open your system’s settings, go to Network & Internet, choose Advanced, there VPN. Choose the gear icon next to Blokada, enable Always-on VPN. Also check our brand specific information for specific solutions for your manufacturer.
If you’re still in need of more ideas check out this thread